Starter J.A. Happ gave up three first inning runs before getting a ground ball double-play to end the inning. He pitched five more scoreless innings and Jacob Barrack, Brian Reed, Joe Bisenius, Andy Baldwin, Matt Parris, Johnson and Shafer shut down the Miracle for the next 14 innings to secure the win.
Clearwater tied the game in the eighth when pinch-hitter Avelion Asprilla scored from third on a wild pitch. Asprilla had doubled to lead off the inning and Burgamy bunted him over to third. Clearwater got their first two runs on a Brian Sellier homerun in the third - his first of the season - and a ground ball that scored Peeter Ramos in the seventh.
In the 20th, Matt Thayer put down a bunt and a throwing error loaded the bases for the Threshers. Ramos hit a ground ball to short and Tuffy Gosewisch, who led off the inning with a walk, was forced out at home, but the bases remained loaded. Costanzo then delivered his single to right to score Burgamy. Mike Dzurilla and J.J. Johnson both flied out for the final two outs of the inning with no further damage.
Shafer pitched a perfect ninth, including striking out Luke Hughes to end the game.
The two teams combined for 19 hits - 12 from the Threshers - over the 20 innings.
See the BoxScore.