Elias Diaz hit a two-run single off Kendall Graveman in the ninth inning, and the Colorado Rockies overcame the loss of starting pitcher Antonio Senzatela to beat the Chicago White Sox 6-5 on Wednesday.
Senzatela, making his second start since returning from a shoulder injury, led 3-2 with two outs in the seventh when Leury Garcia hit a comebacker off the pitcher's left shin that rolled away for a single. The 27-year-old right-hander threw some warmup pitches before walking off the mound.
After Senzatela left, Lucas Gilbreath allowed three straight runners, including Tim Anderson's RBI single. Carlos Estevez replaced him and A.J. Pollock hit his first pitch for a two-run single as the White Sox went ahead 5-3.
Jose Iglesias, who drove in a pair of runs, had an RBI single in the bottom half off Jose Ruiz.
With closer Liam Hendricks unavailable after throwing 27 pitches Tuesday, Graveman (3-2) blew a save for the fifth time in 10 chances.
He walked Brendan Rodgers, Iglesias and Ryan McMahon on 16 pitches, then gave up Diaz's hit on a first-pitch sinker. Iglesias slid home as right fielder Andrew Vaughn's throw skipped to the backstop to give Colorado only its second walkoff win this season.
Robert Stephenson (2-1) pitched a perfect ninth as Colorado won for the second time in seven games.
Chicago (49-49) had been trying to move two games over .500 for the first time since April, when the White Sox opened 6-2 and then lost eight in a row. White Sox pitchers walked nine in Chicago's 16th loss this season after leading.
Charlie Blackmon hit his 39th leadoff homer, his third this season, and C.J. Cron drove in his 71st run for the Rockies, who built a 3-0 first-inning lead.
Yasmani Grandal had a two-run single in the fourth for the White Sox, who played their second of 19 straight games against teams with losing records.
Lucas Giolito allowed three runs, six hits and four walks, needing 104 pitches to get through five innings.
Lance Lynn (1-3, 6.43 ERA) starts Friday night against Oakland RHP James Kaprielian (1-5, 4.74) to kick off a six-game homestand.
