The game-winning run scored in the ninth in both games.

CULIACAN 6, OBREGON 4 IN CULIACAN

Game summary: Culiacan led 3-0 after four. Obregon tied in the seventh and took a 4-3 lead after eight. With one out in the ninth, Karim Garcia hit a three-run walk-off homer.

Obregon: David Reyes struck out three in 3.2 scoreless innings of relief, allowing no hits and one walk. Agustin Murillo was 3-for-5 with a home run and scored twice.

Culiacan: Rodrigo Lopez (Philadelphia) struck out six in six innings, allowing two runs on seven hits and a walk. Ronnier Mustelier (Yankees) was 2-for-4 with a double and a home run.

MEXICALI 4, GUASAVE 3 IN GUASAVE

Game summary: Mexicali scored three in the fourth to take a 3-1 kead, Guasave tied it with two in the seventh. Roman Pena delivered an RBI single in the ninth to put Mexicali ahead to stay.

Mexicali: Marco Duarte (Boston) struck out eight in six innings, giving up one run on six hits and no walks. Geronimo Gil was 2-for-4 with two doubles, scoring once and driving in one.

Guasave: Jesus Cota was 3-for-4 with a double and a two-run homer. Zelous Wheeler (Baltimore) was 2-for-4.