Leake, who will be a free agent at the end of the season, is in his sixth MLB season, all with the Reds. This season, Leake, 27, is 9-5 with a 3.56 ERA in 21 starts, including eight shutout innings in a 4-0 win over St. Louis on Tuesday.
In his career with the Reds, Leake is 62-47 with a 3.87 ERA.
The Reds receive the Giants’ top prospect — RHP Keury Mella — and minor league infielder Adam Duvall for Leake.
Mella, 21, is 15-12 with a 3.01 ERA and 282 strikeouts in 272.1 innings in four minor-league seasons. In 16 starts this season at high Class A San Jose, Mella went 5-3 and ranked fourth in the California League with a 3.31 ERA. Selected to play in the All-Star Futures Game this summer at Great American Ball Park, Mella is ranked the Giants top prospect by MLB.com’s MLB Pipeline.
Duvall, 25, is a Louisville, Ky. native who hit .279 with 26 home runs and 79 RBIs in 99 appearances for Class AAA Sacramento. Entering Thursday’s games, he led the Pacific Coast League in home runs and total bases (218). He’s played first base, third base and outfield this season. In his major league debut last season, he homered off of Leake for his first career hit.
The Giants, who have won the World Series in two of the last three seasons, are 1/2 game behind Los Angeles in the National League West Division standings.
The Reds traded another starting pitcher — Johnny Cueto — to Kansas City on Sunday.