OAKLAND, Calif. (AP) -- Jon Lester won his Oakland debut while pitching into the seventh inning and Jonny Gomes got two hits during an eight-run burst in his return to the Athletics as they beat the Kansas City Royals 8-3 Saturday.
Two days after being traded from the sagging World Series champion Boston Red Sox, Lester and Gomes teamed up to boost the club with the best record in baseball.
The 6-foot-4 Lester (11-7) instantly became an imposing presence on the mound in the pitcher-friendly Coliseum. Fans in the crowd of 30,097 cheered the lefty as he went through his warmup routine in left field, then Lester tipped his cap to a roaring ovation when he left after throwing 62⁄3 innings.
Back with the AL West-leading A's, Gomes delivered in an eight-run fifth inning. He singled and scored off Jason Vargas (8-5), then hit a hit a two-run single off Aaron Crow.
Lester gave up three runs and nine hits, walking one and striking out three.
Pitching on seven days' rest after being scratched Wednesday ahead of the trade deadline, Lester improved to 8-3 with a 2.20 ERA in 12 career starts against the Royals. He hasn't lost in nine starts overall since June 7 at Detroit.
The A's went ahead with their planned promotion, passing out 10,000 Yoenis Cespedes T-shirts reading "La Potencia" -- it pays tribute to his power. The two-time Home Run Derby champ was traded to Boston in the big deal.
An inning earlier, the umpires went to replay to determine whether A's catcher Derek Norris improperly blocked the plate when he tagged a sliding Alex Gordon. The out call was confirmed, with newly acquired center fielder Sam Fuld's throw resulting in a sensational double play.
YANKEES 6, RED SOX 4
BOSTON -- Derek Jeter had a two-run double, Mark Teixeira hit a solo homer and New York's bullpen worked 41/3 solid innings, leading the Yankees to a 6-4 victory over the Boston Red Sox on Saturday.
Stephen Drew, acquired from the Red Sox on Thursday, added an RBI double as the Yankees won for just the second time in six games.
Shawn Kelley (2-3) pitched 11/3 innings of hitless relief for the victory and David Robertson got the final three outs for his 28th save.
Allen Webster (1-1) couldn't overcome his wildness and was pulled after giving up four runs. He walked six, fanned one and allowed two hits in 22/3 innings.