The Nationals announce 22 year-old right-hander Stephen Strasburg will undergo Tommy John surgery to repair a torn ulnar collateral ligament, which will require about 12 to 18 months of rehabilitation. The rookie sensation, whose presence on the mound earlier in the season brought President Obama, along with his two daughters, to Nationals Park to watch the phenom pitch against the White Sox, finishes his freshman year with a 5-3 won-loss record in his 12 starts, striking out 92 batters in 68 innings while compiling an ERA of 2.91.

Braves starter Tommy Hanson, who begins the game without having given up a homer in his last 47.2 innings on the mound, sees his streak end when Marlin leadoff hitter Cameron Maybin drills the first pitch of the game into the left-field seats at Turner Field. Logan Morrison, the next batter, then connects off the Atlanta right-hander for his first major league round-tripper, making it the first time in franchise history that Florida has led off a game with back-to-back homers.

The Twins strengthen their bullpen for the postseason, picking up Brian Fuentes from the Angels in return for a player to be named later, a few days after claiming Randy Flores on waivers from the Rockies.

Jay Bruce hits three home runs in Cincinnati’s 7 – 1 win over the Cubs. Chris Valaika also homers off Cubs starter Tom Gorzelanny for his first major league long ball as Johnny Cueto picks up the win.