It all happened in the early stages of the big match...
Japan scored twice in the 1st inning and once in the second against a shaky Mexican starting pitcher (Horacio Ramirez), meanwhile Mexico could only answer with a solo HR by Jonathan Jones in the top of the 4th...
apart from that, the game was totally under control of the pitching staffs, with Imanaga (starter), Kaino, Yamamoto (relievers) and Yamasaki (closer) givin'up only 1 hit and 2 base-on-balls in 9 innings...
Final score: Japan, 3 b. Mexico, 1
Boxscore
https://premier12.wbsc.org/en/2019/schedule-and-results/box-score/3965
following this game, the standings before the rest day (tomorrow) look like this:
Japan, 3W - 1L
Mexico, 3W - 1L
South Korea, 2W - 1L
Chinese Taipei, 1W - 2L
Australia, 1W - 3L
United States, 1W - 3L
the key games on Friday and Saturday are: USA vs TPE above all, because a US loss would eliminate them from both the Olympic race for the Panamerican spot and the chance to reach the Bronze Medal match...
then, MEX vs KOR, with a lot of implications for both teams (and JPN, too)...
finally, according to the results of those 2 match-ups, JPN vs KOR and/or TPE vs AUS could also become decisive for the Olympic qualification and also the final placements in the Super-Round (and the consequential qualification to the Gold and/or Bronze Medal matches)...
in a few words, we have 4 games left (all of them with potential big implications in the outcome of the whole tournament) and a totally undetermined situation in the standings...could someone ask for more?