Two teams hoping to make this year's postseason field will square off in Phoenix on Friday when the Arizona Diamondbacks (71-56) host the Seattle Mariners (72-56) as solid home favorites at sportsbooks.
Despite having one more win, the Mariners find themselves 5.5 games behind the defending World Series champion Houston Astros in the American League West while the Diamondbacks lead the National League West by 1.5 games over the Colorado Rockies thanks in part to a three-game winning streak.
MLB betting line: The Diamondbacks opened as -157 favorites (wager $157 to win $100); the total is at 8.