The TinCaps lost their grip on a two-run lead and on second place in the Midwest Leagues Eastern Division standings.
Zach Maggards three-run home run in the sixth inning Wednesday night gave the West Michigan Whitecaps a 3-2 victory over Fort Wayne in front of 5,505 fans at Fifth Third Ballpark.
That allowed Lake County, which defeated South Bend 9-3, to leapfrog the TinCaps in the standings.
Fort Wayne (32-26) remains on pace for one of the two divisional playoff spots from the second half of the season. It trails Lake County (32-25) by a half-game and is two games up on fifth-place West Michigan (30-28).
Because they finished in the top two during the first half, Bowling Green (34-23) and Lansing (30-26) already have playoff spots.
The TinCaps (63-65 overall) scored in the first inning Wednesday on Mike Gallics RBI groundout, and they took a 2-0 lead in the fourth when Matthew Colantonio was walked by Marcelo Carreno with the bases loaded.
Travis Jankowski was 2 for 4 with a run for Fort Wayne, while Yeison Asencio was 2 for 4 with a run. Duanel Jones and Colantonio also had multiple hits.
James Jones (2-4) took the loss and got his first blown save, allowing two hits, despite striking out five, in two innings.