The losing team will go on to play in the one-game National League Wild Card game, with the victor getting a few days off before advancing to the NL Division Series.
After the Giants failed to play spoiler Sunday in a 14-0 blowout loss to the Dodgers, and the Rockies beat the Nationals 12-0, Los Angeles and Colorado will square off in one more game for the NL West title on Monday.
It's a spot that they've rarely been in their franchise's history, making Monday's Game 163 an event to behold. German Marquez, who struck out eight straight batters to begin his last start, takes on Manny Machado, Justin Turner and their Los Angeles teammates.
The title-winning Red Sox, Indians, Astros and Braves will advance to the postseason along with the Brewers, Cubs, Rockies and Dodgers plus the Yankees and Athletics, the two American League wild-card teams.
While the Dodgers did all they could to win their division, the Rockies countered with a 12-0 victory over the Nationals. League championship series open October 12 in the National League and October 13 in the American League. The left-hander is 6-2 with a 1.60 ERA in 10 starts against Milwaukee.
The Brewers likewise got out to an early lead, getting two in the first inning before rolling to an 11-0 win over the Tigers.
Since the tiebreakers are considered game No. 163 of the regular season, all stats Monday will count, giving Yelich a chance to win the first NL Triple Crown since Joe Medwick in 1937.
"We need to be ready to go", Yelich said. Chacin is 15-8 and a 3.56 ERA in 34 starts, but the Brewers' deep bullpen might be the biggest concern for the Cubs.
If the Cubs lose they will face that team Tuesday night at Wrigley Field.