HANOVER, N.H. — A 42-minute delay for lightning did nothing to change the fortunes of the Dartmouth baseball team on Tuesday afternoon as visiting UMass Lowell rapped out 13 hits with a pair of home runs to defeat the Big Green at Red Rolfe Field at Biondi Park by a final of 9-5.

Colby Maiola and Cam Climo provided the power with the four-baggers for the River Hawks (15-12) as all nine starters had at least one hit and seven drove in at least one run.

Sophomore Nate Ostmo doubled, tripled and scored twice for the Big Green (15-11), which put 20 runners on base over the course of the game. But Dartmouth left the bags loaded three times as they stranded 13 runners in all.

The River Hawks jumped on starter Jackson Bubala (0-4) in the first inning, starting with Steve Passatempo’s single to plate one run before Maiola hit an opposite-field fly to left that just cleared the fence for a two-run blast and a three-run lead.

It looked as if Dartmouth might get those runs back in the bottom half as UML starter Ricky Constant battled control issues, walking three of the first four batters. The one who didn’t, however, flew out into a double play with a runner being gunned down at third. That meant the third walk, single and hit batter only brought home one run before Constant got the third out on strikes.

Freshman Austen Michel trotted to the mound to start the second for the Big Green, and he pitched well over three innings, striking out six. But he was also touched for a pair of runs on an RBI double by Chris Sharpe in the second and a run-scoring single by catcher Nick Barry in the fourth to boost the River Hawk lead to four at 5-1.

Constant, meanwhile, settled down and allowed just two base runners over the next three innings before running into more trouble in the fifth as he walked three more batters. But two came after a two-out RBI double off the bat of Michael Ketchmark, and Constant was able to leave the bases loaded once again to finish his five innings on the mound.

John Polichetti, who led the River Hawks with three hits, stroked an RBI single into right-center in the sixth for a 6-2 lead, though he was thrown out trying to stretch his hit into a double.

Dartmouth took advantage of a pitching change to start the bottom of the sixth as Ostmo greeted David Hoar III with a ringing double to left-center and scored one out later when freshman Trevor Johnson lined a single that skipped past the right fielder, sending Johnson to third. Sophomore Matt Feinstein followed by yanking a pitch past the diving third baseman for an RBI, and the Big Green eventually loaded the bases again with two down. A hard grounder off the bat of junior Dustin Shirley was stabbed by the second baseman Polichetti, who flipped the ball to first to deny Dartmouth a possible game-tying hit.

After Ostmo tripled into the right-field corner and scored on an infield out to make it 6-5 in the seventh, things were looking up for the Big Green. But UMass Lowell responded with two runs in the top of the eighth as Climo belted the first pitch of the inning onto Park Street beyond the left-field fence, and Oscar Marchena hit a deep fly to right to bring home Polichetti who had doubled.

In the Dartmouth half of the eighth, Feinstein and junior Kyle Holbrook both walked to start the frame before the weather delayed the action with lightning in the area. Play surprisingly was able resume at 6:25 as the skies lightened up after the 42-minute delay, but reliever Luke Tomcyzk quickly escaped his own jam with a strikeout and a double play grounder.

UMass Lowell tacked on an insurance run in the ninth and allowed just one base runner in the bottom half (on the 11th walk issued by River Hawk pitchers) to close out the road victory.

Constant (2-0) earned the win despite walking seven batters and hitting one over five innings, allowing two runs on three hits to go with three strikeouts.

Feinstein and Ketchmark joined Ostmo with two hits, and Johnson scored two runs as well while eight of the nine hitters in the starting lineup drew at least one free pass as well. The walk for Holbrook in the eighth extended his streak of reaching base to 18 straight games.

Dartmouth continues its 10-game homestand this weekend when Brown (9-14, 3-5 Ivy) come to Red Rolfe Field at Biondi Park for noon doubleheaders on Saturday and Sunday. All four games will be streamed live in HD on the Ivy League Digital Network with Wayne Young ’72 calling the action.

Notes: UMass Lowell has won the last two games against Dartmouth and is 9-5 all-time in the series between the two ... the seven Big Green pitchers combined to strike out 12 batters, tying a season high.