In the longest game ever played in Texas League history, the San Antonio Missions beat the visiting Jackson Mets in 26 innings, 1 – 0. The Keefe Stadium contest, which started on July 14th, was suspended at 2:25 a.m. the following day and continued today, taking a total of 7 hours and 23 minutes to complete.

On July 16, 1988 In the longest game ever played in Texas League history, the San Antonio Missions beat the visiting Jackson Mets in 26 innings, 1 – 0. The Keefe Stadium contest, which started on July 14th, was suspended at 2:25 a.m. the following day and continued today, taking a total of 7 hours and 23 minutes to complete.

Source
Baseball Reference July 16