In this task, you are given news articles and you need to generate a highlight, i.e., a short summary, with a maximum length of 10 lines.

Q: (CNN) -- Marin Cilic made a winning return to the ATP circuit Monday after serving a reduced doping ban. The 25-year-old Croatian completed a tight three set victory over Dutchman Igor Sijsling at the Paris Masters, prevailing 5-7 6-1 6-4 at Bercy Stadium. Cilic has slipped to World No.47 after testing positive for the stimulant nikethamide at the Munich Open in May. He was banned for nine months by an independent tribunal in September, but his appeal to the Court of Arbitration for Sport saw his suspension cut to four months last Friday. The decision allowed Cilic to enter the final regular season tournament on the main tour in the French capital and he took full advantage. Despite losing the first set, Cilic earned a second round match against in form World No.5 Juan Martin Del Potro of Argentina. He later admitted that he was pleased to put the experience behind him and return to action. "I would definitely say it was the worst time of my life as a player," he told AFP. "I have been on the tour for six, seven years, and have been always really careful and really honest and fair as much as I could with all the other players. "And then to be in that kind of situation where when I found out about the positive test it was an extremely difficult situation where people were even calling me a doping player and a cheat. "I knew I didn't cheat," added Cilic. World No.1 Rafael Nadal, who is playing in Paris for the first time in four years, told gathered reporters that he was delighted to see Cilic return to action. "One thing I can say is I'm happy to see Marin back on tour. He's a good guy and a great player," he told AFP. "I don't know what happened but if he's back, it's because it's fair that he's back. That's all. I'm happy for that." Nadal will open his campaign later in week but the early headlines will surround players attempting to book their passages to the ATP World Tour Finals in London. Roger Federer, Swiss colleague Stanislas Wawrinka and French duo Richard Gasquet and Jo-Wilfried Tsonga are battling for the final three places in the elite eight-man field, with four others having mathematical chances of qualifying. Wawrinka learned his second round opponent in Paris as Spaniard Feliciano Lopez won a tight encounter against Australian qualifier Bernard Tomic 6-4 6-7 7-6 Monday. Federer, who needs one win to clinch a 12th consecutive appearance in the finals, will face the winner of the first round match between Kevin Anderson and Mikhail Zouzhny, while Gasquet and Tsonga could meet in the third round of their home event. World No.2 Novak Djokovic claimed the ATP finale last season, beating Federer in the final, while Nadal has never claimed the title. The Spaniard hopes to use a good performance in Paris as a springboard to success in London. "The last tournament of the year is important," he told the official ATP Tour website. "In 2010 I played well (lost in the final to Federer); the rest I played really bad. I want to try to change that. "I was always motivated for this last part of the season, but I was not able to apply it well. I hope this year I can change that situation. I hope to play well here and then we'll see."

A: Marin Cilic wins on return to ATP Tour after doping ban .
Court of Arbitration cut his suspension from nine to four months .
Cilic beats Igor Sijsling in first round of Paris Masters .
Rafael Nadal playng tournament for first time since 2009 .
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Q: Yaounde, Cameroon (CNN) -- Heavily armed poachers recently killed nearly 40 endangered forest elephants for their ivory in two national parks, officials in Cameroon said Tuesday, the latest in a string of slaughters of the animals in Central Africa. "The carcasses are still fresh, indicating the killings took place probably only this month," ecologist Theophile Mbarga told CNN on Tuesday. Very young -- even newborn -- elephants were among the carcasses found in Nki and Lobeke national parks. The toll could reach 50 after a thorough search is made, Mbarga added. The dead elephants were found closely clustered -- less than 35 feet apart -- indicating the poachers used powerful, modern weapons, conservation group WWF project manager Zacharie Nzooh told journalists Tuesday. Evidence indicates that a horseback-riding band of about 300 poachers from Sudan was behind the slaughter, officials said. The same poachers were believed to be responsible for hundreds of elephant deaths over the past year. Forest elephants are distinguished from the more familiar savanna elephants by their smaller size and straighter tusks. A kilogram (2.2 pounds) of their ivory sells for hundreds of dollars on the underground market in places such as China and Thailand. Political analysts say the proceeds fund rebel groups in Sudan and the Central African Republic. A recent peer-reviewed study published at PLOS One documented a "catastrophic" 62 percent decline in Central Africa's forest elephant population over nine years. Officials estimated that 1,700 forest elephants remain in the two Cameroonian parks. It is feared they will be completely wiped out within seven years. Savanna elephant populations in the Central African Republic are believed to have plummeted from around 80,000 just 30 years ago to a few hundred today, according to WWF, formerly known as the World Wildlife Fund. The governments of three Central African nations -- Cameroon, the Central African Republic and Chad -- announced Saturday they would muster as many as 1,000 soldiers for joint military operations to protect the region's last remaining savanna elephants, as the Sudanese poachers are still active in the region. "We recommend the mobilization of all defense and security forces in the affected countries" to stop the poachers, members of the Economic Community of Central African States said in a joint statement. The communique was issued at the end of a three-day emergency anti-poaching ministerial conference held in Cameroon's capital, YaoundÃ©. The operation is estimated to cost about $2.3 million. The announcement called on other nations to contribute additional funds to sustain the effort. On the night of March 14 to 15, poachers slaughtered killed at least 89 elephants in southern Chad, WWF said. They are also believed to be behind the killing of at least 30 elephants in the Central African Republic since January 1. The poachers on horseback are also suspected of killing 300 elephants in Cameroon's Bouba N'Djida National Park in early 2012. The carnage prompted Cameroon to mobilize 600 elite troops to try to keep the poachers from crossing the border again, WWF reported. In the statement, the ECCAS states congratulated Thailand for its March 3 decision to ban its legal domestic ivory trade and urged its vigorous enforcement. Ivory consumers "need to be sensitized to the consequences" of the ivory trade, the statement said, adding that "destination countries (should) adopt measures to reduce ivory demand." Robert Jackson, the U.S. ambassador to Cameroon, said he was pleased with the meeting. "The plan is a good one. But execution is now critical." he said. "I am, however, concerned that there is no mention of corruption in the statement, because it contributes directly to the poaching and trafficking problem," he said. CNN's Jim Kavanagh contributed to this report.

A: Nearly 40 endangered forest elephants were killed in 2 parks .
300 Sudanese poachers on horseback are believed to be responsible .
Forest and savanna elephant populations have declined drastically .
Central African nations agree to mobilize 1,000 soldiers to fight poaching .
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Q: (CNN) -- Manchester United ended 10-man Chelsea's hopes of winning a trophy this season with a 2-1 home victory that put Alex Ferguson's side into the semifinals of the Champions League for the fourth time in five seasons. A goal in each half from Javier Hernandez and Park Ji-Sung ensured a 3-1 aggregate win for the English Premier League leaders, who beat Chelsea in the 2008 final on penalties in Moscow. United will next face either defending European champions Inter Milan or Schalke, who hold a 5-2 lead ahead of Wednesday's second leg in Germany. The future of Chelsea coach Carlo Ancelotti is now in considerable doubt after a disappointing season which has seen the London side's domestic title reign realistically over with seven games to play. Ancelotti in troubled waters at the Bridge . The Italian raised eyebrows when he chose to start misfiring $80 million signing Fernando Torres up front with Nicolas Anelka and Florent Malouda flanking him, leaving former spearhead Didier Drogba on the bench. The Ivory Coast striker made an immediate impact after replacing Torres at halftime, and got Chelsea back into the match soon after Ramires' 70th-minute sending-off -- only for poor defending to allow United to regain a two-goal overall lead straight away. "A lot of people thought Drogba would play," Ferguson told reporters. "I thought having signed Torres for the money they did they had to play him. I wasn't 100% sure but I couldn't see how they could leave Torres out." Ancelotti admitted he might have made a mistake in starting the Spain striker, who has not scored since leaving Liverpool at the end of January. "Maybe. Could be. I told you a lot of times this season I wanted to start with Fernando for this kind of game, these type of tactics," the former AC Milan coach said. "Didier played well in the second half. I wanted to put more pressure up front because we needed to score. Didier was fresh and he could use his power up front. This was the reason I took out Fernando." The home side, having survived some early scares, thought they had scored in the 27th minute when Hernandez stole in at the near post to head home Wayne Rooney's cross, but the Mexico international strayed marginally offside. The breakthrough came two minutes before halftime as veteran Ryan Giggs combined well with John O'Shea to burst into the right side of the penalty area and slide a pinpoint low cross with his favored left foot to an unmarked Hernandez at the far post. Messi record as Barcelona go through . Ancelotti replaced Anelka, the club's top scorer in Europe this season, with Salomon Kalou after an hour but United could have gone further ahead as goalkeeper Petr Cech did well to keep out a low shot from Nani and then Giggs aimed a weak header after more good work by Rooney. Ramires, who was denied a penalty in injury-time in the first leg at Stamford Bridge last week, received his second yellow card after a tackle from behind on Nani. The first, also for a foul on the Portugal midfielder in the opening half, had already meant the Brazil midfielder would have been suspended for the first leg of the semifinal if Chelsea had progressed. With Nani replaced by Antonio Valencia in the 75th minute, Chelsea took advantage to level on the night as Michael Essien picked out Drogba with a lofted through pass and the 33-year-old chested the ball down and fired a low shot past Edwin van der Sar. Rooney gives Manchester United the edge . But Chelsea's excitement lasted less than 30 seconds as United surged forward, with Rooney and Giggs combining to set up hard-working South Korean midfielder Park -- who slotted in a low left-foot shot. It was the 37-year-old Giggs' third assist of the quarterfinal, having also set up Rooney's first-leg winner. The win kept United, the European runners-up in 2009, on course for a treble this season ahead of Saturday's FA Cup semifinal against local rivals Manchester City.

A:
Manchester United win all-English semifinal 3-1 on aggregate after home victory .
Javier Hernandez and Park Ji-Sung score either side of Didier Drogba's equalizer .
Veteran Ryan Giggs sets up both United goals to add to his first-leg assist .
Chelsea coach Carlo Ancelotti faces the sack as last chance of silverware ends .
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