Defiance won the opener 9-7 before Coast Guard won the nightcap 10-7 in eight innings.
The Bears are now 3-4 on the southern swing and 3-6 on the season while Defiance is 6-3 on the year.
In game two, Coast Guard had managed just one hit in the first six innings of the seven inning game, a single by sophomore Kyle Wood in the fifth, and trailed 5-0 after six innings.
The Bears woke up in the seventh as sophomore Mark Behne and senior Lukas Laplante started the inning of with back-to-back walks before Wood delivered a one-out RBI single to get the Bears on the board and chase Defiance starter Dave Blanch from the game.
Following a flyout, a dropped pop up which should have ended the game scored a pair of runs to cut the deficit to 5-3. Freshman Michael Jeffko kept the Bears rally alive with a single before junior Dan Sabourin's infield single loaded the bases setting the stage for Thompson's deep triple to right field giving the Bears a 6-5 lead.
Thompson would come on in the bottom of the inning and get the first two outs before the Yellow Jackets got a pair of singles with a wild pitch in between to tie the game and send it to extra innings.
Sophomore Cory Sonnega's RBI single gave the Bears a 7-6 lead before freshman Justin Rebolz drew a bases loaded walk and Sabourin added a two-run single for a 10-6 advantage.
Thompson (1-0) allowed a run in the home half, but got a flyout to end the game. To pickup his first collegiate win.
Junior Andrew Lucak pitched great for the Bears as he went the first six innings and scattered nine hits allowing just one earned run while walking one and striking out three.
Sabourin and Wood each had two hits in the game two win to lead the Bears.
In the opener, Defiance took advantage of four walks and a pair of hit batters in the first inning and scored five runs on just one hit for an early 5-0 lead.
Coast Guard got two runs in the first on an RBI triple by sophomore Mark Behne and a sacrifice fly by Laplante.
The Yellow Jackets got two more it the second inning, again on just one hit, taking advantage of four more walks and a hit batter for a 7-2 lead.
The Bears got two back in the fifth on an RBI ground out by Behne and an RBI single by junior Matt Hanks to make the score 7-4.
Defiance got a pair of unearned runs in the sixth to make the score 9-4 before Coast Guard scored three in the home half of the sixth as freshman Kyle Jackson tripled and scored on a ground out by Sonnega before Thompson and Behne had RBI singles.
Coast Guard threatened in the bottom of the seventh down 9-7 as Hanks reached on error, Wood walked and Jackson bunted them over, but back to back strikeouts ended the game.
Freshman Justin Rebholz was outstanding in relief in the loss as he worked 4 1/3 innings allowing four hits and a pair of unearned runs while walking one and fanning two. Junior Dylan Wright also threw an inning of scoreless relief for the Bears.
Behne had three hits and two RBI's in the opener while Thompson and Hanks each had two hits. Sabourin reached base safely all four times with a single and three walks while he also stole a pair of bases in game one.
Freshman Colton Cannon (1-2) lasted just 2/3 of an inning in taking the loss as he was charged with five runs, all earned, with four walks and a hit.
Coast Guard closes out its southern trip to the Gene Cusic Classic on Saturday against St. Lawrence with a single game at 9 a.m.
POST GAME INTERVIEW WITH HEAD COACH C.C. GRANT