Bruce Berk said he doesn’t keep track of his Derryfield School boys tennis team’s successes from year to year.

Maybe he’s just lost count.

The Cougars have reached the state final 15 of the last 18 years, and they have 12 titles in that span, including the last six.

Most recently, they wore the 2008 Class M-S crown by defeating No. 2-seeded Gilford, 8-1, on May 24 at Plymouth State University.

Though DS finished the season undefeated in the state of New Hampshire, the team’s lone loss came against Massachusetts power Chelmsford, 5-4, on April 16. It beat the same team, 4-1, on April 23.

And there’s no questioning the Cougars’ sheer dominance in the Granite State.

Of their 12 in-state contests this season, they were only unable to shutout one foe. Gilford notched a match in the title game and also lost, 7-2, on April 14.

Derryfield outscored its Granite State opponents, 123-3. Though his squad competes against Class M-S competition, Berk had to admit it would be interesting to see how his squad performs against the top programs from Class L and I on a regular basis.

“I think Hanover may be the strongest team in the state, and we scrimmaged them last week,” he said “The difference between a win and a loss for us was a 9-7 doubles match we dropped, so I’d say that’s a pretty clear indication for us on how well the team could do out of the division.”

No. 1 Alex Greene and Bedford’s Than Moore, the team’s No. 2, led the squad this season. “These are two kids, at the top of the ladder, that have devoted every weekend through the summer and 12 months a year to perfecting their tennis games, and I think Than Moore, especially, has symbolized why this team is so successful,” said Berk. “Not just this year, but for three or four years he’s had the same approach. He and Alex are just relentless competitors, and the tougher the competition, the tighter the match, the better they play.”

Both athletes, added Berk, have led by example and have not only shown marked improvement in their games, but have made those around them better.

“We knew that these two kids were not only going to be two of the top players in our division, but two of the top players in the state,” he said. “Then we complemented them with a couple kids that played last year, and freshman Harry Morgan and also Carsten Christandl. And we knew we had a very strong team coming into this season.”

Berk said Christandl, a Bedford native, is a “big, left-handed serve and volley kid” with the strongest ground strokes he’s seen in a long time.

“Sometime during the season a light went on for him,” said Berk. “He realized that you can’t win or lose all the points in tennis; you let the other guy lose the points. He finally figured that out, and he’s played fabulous tennis.”

Derryfield’s No. 4 and No. 5, Akash Vadalia and Anuj Vadalia, used their superb speed and athleticism to create dominance at the bottom of the ladder, said Berk, while Dunbarton’s Finn Westbrook and Bedford’s Justin Eldridge and CJ Keyes provided stiff competition for starting spots.

“CJ Keyes was the only freshman on the team last year, and he’s a very steady player who worked hard on his game and made a lot of improvements from last year,” said Berk. “I mean kids like CJ, Finn and Justin could be starting for a lot of other teams around the state and winning most of their matches, but they’re competing for playing time here. It gives me a lot of comfort knowing a kid like CJ is going to come back and finally get a chance to play in the starting lineup on a regular basis.”

Other locals on this year’s said include Bedford’s Rex Rodanas and Hooksett’s Dan Jin.

“I’ve been doing this for 25 years, and I don’t necessarily need to compare teams, but certainly this has been one of my stronger units ever,” said Berk.