CHICAGO (Interstat) — Michael Busch hit a three-run triple and a sacrifice fly, and the Chicago Cubs defeated the Arizona Diamondbacks 8-4 on Sunday afternoon at Wrigley Field, extending their winning streak to five games.

Moisés Ballesteros homered and drove in two runs as Chicago won for the 15th time in its last 18 games. Matthew Boyd pitched six innings, allowing two earned runs on four hits while striking out five, to improve to 2-1. The Cubs improved to 22-12, a season-high 10 games over .500, and won their 11th consecutive home game, their longest such streak since winning 14 in a row at Wrigley Field in 2008.

The Diamondbacks fell to 16-17. Merrill Kelly took the loss, dropping to 1-3.

Arizona took a 2-0 lead in the second inning when Gabriel Moreno hit his first home run of the season, a two-run shot to left-center field that scored Nolan Arenado, who had doubled. The Cubs answered in the bottom half. Michael Busch doubled, and Carson Kelly singled to center to drive in Busch, cutting the lead to 2-1.

Chicago seized the lead in the third. Nico Hoerner singled, and Ballesteros followed with his sixth home run, a line drive to left-center that scored Hoerner and made it 3-2. The Cubs added to their advantage in the fifth. Ballesteros walked, and after a fielder’s choice and a walk to Ian Happ loaded the bases, Busch tripled to right field, clearing the bases and extending the lead to 6-2.

The Cubs tacked on two more in the seventh. Ian Happ walked and Seiya Suzuki doubled. Busch then lifted a sacrifice fly to right, scoring Happ. Carson Kelly followed with a single to left, plating Suzuki for an 8-2 lead.

Arizona mounted a rally in the ninth. Lourdes Gurriel Jr. walked, and pinch-hitter Adrian Del Castillo hit his third home run, a two-run shot to center field, cutting the deficit to 8-4. But the comeback fell short.

Busch finished 2 for 3 with four RBIs. Ballesteros went 2 for 4 with a home run and two RBIs. Carson Kelly added two hits and two RBIs. For Arizona, Moreno was 1 for 4 with a home run and two RBIs, and Del Castillo went 1 for 1 with a home run and two RBIs.

Phil Maton pitched a scoreless seventh inning for the Cubs, allowing one hit. Hoby Milner worked a scoreless eighth. Ryan Thompson and Paul Sewald each threw two-thirds of an inning of scoreless relief for Arizona. The game lasted 2 hours, 45 minutes in front of 35,597.

The Cubs have now won each of the first three games of this four-game series, having taken the previous two by scores of 6-5 and 2-0. They will host the Cincinnati Reds on Monday. The Diamondbacks return home to face the Pittsburgh Pirates on Tuesday.

Interstat’s game simulator had projected a final score of Chicago Cubs 7, Arizona Diamondbacks 3. Interstat’s ELO system gave the Cubs a 60.90 percent probability of winning, and the Cubs were installed as the pregame favorite with a spread of minus 1.5.