The Boston Red Sox came back from a one-run deficit to beat the Arizona Diamondbacks 9-4 at Fenway Park on Tuesday, August 18, 2026, finishing nine innings and handing Arizona starter Merrill Kelly a rough outing. Adley Rutschman led the offense with a home run and three RBI, Mickey Gasper went deep as well, and a bullpen trio of Tyron Guerrero, Erik Miller, and Wyatt Olds held Arizona scoreless over the final 3.2 innings to lock down the win. The five-run margin tells the full story: Boston had the bats and the arms when it mattered most.

Red Sox Offense Buries Merrill Kelly Early

Kelly lasted just four innings for Arizona, allowing seven hits, six earned runs, and four walks while striking out only two. Boston's lineup took full advantage. Rutschman went 2-for-4 with a homer and three RBI. Gasper was even more efficient, going 2-for-2 with a home run and two RBI. Willson Contreras added two hits and an RBI, and Andruw Monasterio chipped in two hits and an RBI of his own. Nick Sogard reached twice in three at-bats to keep the lineup moving. Five different Red Sox batters recorded multi-hit games — that kind of across-the-board production is what buries a pitching staff.

Ranger Suarez Picks Up the Win Despite a Rocky Start

Ranger Suarez did not cruise. He gave up four earned runs on four hits over 5.1 innings, walking two and striking out three. Gabriel Moreno did most of the damage for Arizona, going 1-for-3 with a grand slam that made it a 5-4 game and briefly gave the Diamondbacks life. But Suarez held on long enough to collect the win, with the Red Sox offense already having built the lead back up beneath him.

Boston Bullpen Shuts the Door

Once Suarez exited, the Red Sox bullpen was spotless. Tyron Guerrero covered 1.2 innings, allowing two hits but no runs. Erik Miller tossed a clean inning — one walk, no hits, one strikeout. Wyatt Olds finished it off with a scoreless ninth, giving up one hit and punching out one batter. Arizona's relievers — Jonathan Loáisiga, Kevin Ginkel, Taylor Clarke, and Justin Martinez — combined to allow three earned runs over their four innings, keeping the Diamondbacks from making any late push.

Key Performances

  • Adley Rutschman: 2-for-4, 1 HR, 3 RBI
  • Mickey Gasper: 2-for-2, 1 HR, 2 RBI
  • Willson Contreras: 2-for-4, 1 RBI
  • Andruw Monasterio: 2-for-4, 1 RBI
  • Nick Sogard: 2-for-3
  • Ranger Suarez (W): 5.1 IP, 4 ER, 3 K
  • Gabriel Moreno (ARI): 1-for-3, 1 HR, 4 RBI

Turning Point

The game tipped decisively when Boston's offense went to work against Kelly in the early innings, building a lead substantial enough to survive Moreno's grand slam. When the Diamondbacks had their best shot to close the gap, the Red Sox still led — and the bullpen made sure it stayed that way.

What's Next

The Red Sox remain at Fenway Park to continue their series against the Arizona Diamondbacks. Boston's pitching depth will be in focus as the series rolls on through the week.