Individual sports are also very popular in Slovenia, including tennis and mountaineering, which are two of the most widespread sporting activities in Slovenia. Several Slovenian extreme and endurance sportsmen have gained an international reputation, including the mountaineer Tomaž Humar, the mountain skier Davo Karničar, the ultramarathon swimmer Martin Strel and the ultracyclist Jure Robič. Past and current winter sports athletes include alpine skiers, such as Mateja Svet, Bojan Križaj, Ilka Štuhec and double Olympic gold medalist Tina Maze, the cross-country skier Petra Majdič, and ski jumpers, such as Primož Peterka and Peter Prevc. Boxing has gained popularity since Jan Zaveck won the IBF Welterweight World Champion title in 2009.