A look at some key numbers since the A's traded slugger Yoenis Cespedes to the Red Sox for ace Jon Lester and outfielder Jonny Gomes:

A's record -- before: 66-41; since: 7-7

Division lead -- before: +2; through Thursday: +2

Starters' ERA -- before: 3.32; since: 3.46

Runs per game -- before: 5.0; since: 3.9

Yoenis Cespedes stats

With A's: Avg.: 256; HR: 17; RBI: 67          

With Boston: Avg.: .239; HR: 2; RBI: 8

Jon Lester stats

With Boston: W-L: 10-7; ERA: 2.52

With A's: W-L: 3-0; ERA: 2.49

Jonny Gomes stats

With Boston: Avg.: .234; HR: 6; RBI: 32          

Oakland Athletics’ Sam Fuld (23), Jon Lester (31) and Jonny Gomes (15) hold up their jerseys after being introduced during a press conference at O.co
Oakland Athletics' Sam Fuld (23), Jon Lester (31) and Jonny Gomes (15) hold up their jerseys after being introduced during a press conference at O.co Coliseum in Oakland, Calif., on Friday, August 1, 2014. (Jose Carlos Fajardo/Bay Area News Group) ( JOSE CARLOS FAJARDO )

With A's: Avg.: .286; HR: 0; RBI: 3



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