Willie Lee McCovey (born January 10, 1938), nicknamed "Mac", "Big Mac", and "Stretch", is an American former Major League Baseball first baseman. He played nineteen seasons for the San Francisco Giants, and three more for the San Diego Padres and Oakland Athletics, between 1959 and 1980. He batted and threw left-handed and was inducted into the Baseball Hall of Fame in 1986. One of the most intimidating power hitters of his era, McCovey was called "the scariest hitter in baseball" by pitcher Bob Gibson, an assessment with which Reggie Jackson concurred.
McCovey returned to the Giants in 1977. With Hank Aaron and Frank Robinson having retired at the end of the 1976 season with 755 and 586 home runs respectively, McCovey began 1977 as the active home run leader with 465. That year, during a June 27 game against the Cincinnati Reds, he became the first player to hit two home runs in one inning twice in his career (the first was on April 12, 1973), a feat since accomplished by only Andre Dawson and Jeff King. One was a grand slam and he became the first National Leaguer to hit seventeen. At age 39, he had 28 home runs and 86 RBI and was named the Comeback Player of the Year. On June 30, 1978, at Atlanta's Fulton County Stadium, McCovey hit his 500th home run, and two years later, on May 3, 1980, at Montreal's Olympic Stadium, McCovey hit his 521st and last home run, off Scott Sanderson of the Montreal Expos. This home run gave McCovey the distinction, along with Ted Williams (with whom he was tied in home runs), Rickey Henderson, and Omar Vizquel of homering in four different decades: the 1950s, 60s, 70s, and 80s. McCovey is one of only 29 players in baseball history to date to have appeared in Major League baseball games in four decades. In his 22-year career, McCovey batted .270, with 521 home runs and 1,555 RBI, 1,229 runs scored, 2,211 hits, 353 doubles, 46 triples, a .374 on-base percentage and a .515 slugging percentage. He also hit 18 grand slam home runs in his career, which is still a National League record.

Q: Why did Willie McCovey return to san francisco?
A: unknown

Q: Can you tell me about the return to san francisco?
A: McCovey began 1977 as the active home run leader with 465.
Was he successful as being the active home run leader?
he became the first player to hit two home runs in one inning twice in his career That year, during a June 27 game against the Cincinnati Reds, he became the first player to hit two home runs in one inning twice in his career That year, during a June 27 game against the Cincinnati Reds, he became the first player to hit two home runs in one inning twice in his career he became the first player to hit two home runs in one inning twice in his career (the first was on April 12, 1973),
he became the first player to hit two home runs in one inning twice in his career (the first was on April 12, 1973),