The TinCaps were swept in their road trip at Lake County, losing the finale of the three-game series 6-5 on a fielding error in the ninth.
The TinCaps tied it in the ninth, but a throwing error from Dustin Peterson allowed Paul Hendrix to score in the bottom half for the win.
Fort Wayne (26-35, 56-74 overall) scored four unanswered runs in the first two innings, which included a two-run homer from Henry Charles, who finished 2 for 4.
The Captains (33-27, 60-70) scored in the fourth then opened the fifth with doubles from Grant Fink and Claudio Batista. Lake County tied the score on a fielding error from Trea Turner and took the lead on an RBI single from Dorssys Paulino.
Ryan Butler (1-1) took the loss, pitching 1 1/3 innings and giving up three hits and an unearned run.
Lake County remains at the top of the playoff race for the second half of the season.
The TinCaps return to Parkview Field today for a three-game series against Bowling Green.