The only goal of the match came five minutes after the break when Jorrin John cut in from the right to strike past Teerawat in the Krabi goal.
The first half was a tightish affair with the home side slightly on top. Both sides had shots cleared off their lines from early attempts before Pipat headed inches wide in the 20th minute for the half's closest effort.
John's strike on 50 minutes proved to be the only goal of the game although the home side could have doubled their lead late on when Bolarinwa Ayotomiwa's shot crept agonisingly wide after a precise pass from Worawut.
The "Suphanblood" have finally hit form after a stuttering start to the season. With the mid-season transfer window set to open soon, you'd expect that Suphanburi will dip into their plentiful resources to strengthen their claim on one of the three promotion spots.
As it stands tonight, Krabi still top the table. Defensively Krabi are pretty solid but they seem to lack potency up front. Carlo Coppari has still to find his feet in Thai football and the Energy could do with Christiano Lopes returning from injury to boost their attacking options.