CLEARWATER, Fla. - Derek Campbell delivered the walk-off smash on Saturday night, driving a leadoff home run down the left field line in the bottom of the ninth to send the Threshers home victorious, 4-3 on Bark at the Ballpark Night at Bright House Field.

Campbell homered twice and finished 3-for-4, upping his average to .333. He has now gone yard four times in his last four games after lifting the Threshers to their third walk-off win of the season.

Shane Watson would not factor in the decision, but worked a gem of a start. Watson scattered four singles and two walks and matched a season-high with seven innings of work, holding the league's top offense off the scoreboard.

Clearwater (9-8) punched home the first two runs of the game in the fifth inning, after Watson and PJ Conlon traded zeros through the front four.

Malquin Canelo and Carlos Tocci connected for consecutive two-out singles, and Zach Green followed by striking a single into center to score Canelo. Chace Numata delivered a knock to center to bring Tocci across before Green was tagged out at the plate to end the inning, but the Threshers left with the lead, 2-0.

Campbell extended that advantage in the sixth. Facing reliever Mike Hepple, Campbell drove an opposite-field shot to the berm in right to make it 3-0 Clearwater.

The Mets (9-7) began to scrape their way back in the eighth. With two on and one out against Jesen Therrien, Vinny Siena singled to load the bases, and John Mora bounced a grounder to first for a fielder's choice that pushed home Tucker Tharp with St. Lucie's first run.

Ulises Joaquin (1-1) entered with the bases loaded and one down, facing two of the league's top-five average hitters. Joaquin induced a key strikeout of Kevin Taylor and a fly out from Tomas Nido to end the inning.

Clearwater took a two-run lead into the ninth, but David Thompson opened the frame with a single up the middle, and Luis Guillorme ripped a triple to right-center to put the tying run on third. With one out, Jhoan Urena tied the game with a single to center.

That set the stage for Campbell, who struck a one-strike pitch deep down the left-field line for the game-winning shot.

The series continues on Sunday Brunch Day as Drew Anderson makes his Clearwater debut against Chris Flexen (5-8), with first pitch at 1 p.m. The game will be broadcast live on the Threshers Broadcast Network starting at 12:45 p.m.