The Houston Astros will enter their final series of the season with a 1.5-game lead over the Seattle Mariners in the American League wild-card race after defeating them 8-3 on Wednesday.

Meanwhile, the Texas Rangers held serve with a 5-0 win over the Los Angeles Angels, preserving a 2.5-game lead over the Astros for the AL West title.

The three teams, who have been neck-and-neck for supremacy in MLB's most competitive division for more than a month, will enter the final series of the season with the division title still at stake. The Rangers will face the Mariners in a four-game series in Seattle, while the Astros will travel to face an Arizona Diamondbacks team still fighting its own battle in the National League wild-card race.

AL West standings

1. Rangers: 89-69

2. Astros: 87-72, 2.5 GB

3. Mariners: 85-73, 4.0 GB

AL wild-card standings

1. Rays: 97-62, +10.0 games

2. Blue Jays: 87-71 +0.5 games

3. Astros: 87-72

4. Mariners: 85-73, 1.5 GB

The division tiebreakers form a perfect triangle. The Mariners hold the advantage over the Astros with a 9-4 record against them, the Astros have the edge against the Rangers via a 9-4 record, and the Rangers get the nod over the Mariners thanks to their 8-1 record.

By virtue of that tiebreaker and the four-game gap between the Rangers and Mariners, there is a lone scenario remaining in which Seattle wins the West. That would require a four-game sweep of the Rangers, with the Astros winning two, and only two, games against the D-backs.

In that case, the Mariners would win a three-team tiebreaker.

The Mariners could've moved into playoff position with a win Wednesday and seemed tantalizingly close to doing so at times. J.P. Crawford led off the bottom of the first inning with a homer to take a 1-0 lead, which was lost in a four-run fourth inning for the Astros on homers by Yordan Álvarez and Mauricio Dubon.

The Mariners cut the lead to one on a bases-loaded single by Eugenio Suarez in the bottom of the fourth, but the Astros put the game away with more scoring in the seventh.

The most bizarre moment of the game, however, came in the bottom of the sixth, when Astros reliever Hector Neris struck out Rodríguez and then aggressively bore down on the young outfielder. Rodríguez didn't appreciate the treatment, and soon the two were being led away from each other while the dugouts and bullpens cleared.

It was a strange moment in a series that had already seen a baseball thrown from the stands at Mariners pitcher George Kirby.

On the Rangers' side of things, Texas scored early against the Angels, while starting pitcher Dane Dunning threw seven scoreless innings. Aroldis Chapman and José Leclerc combined to finish the shutout, leaving Texas needing to win only two of four games against the Mariners to seal the division, even if the Astros sweep the D-backs.