FORT WORTH, Texas—Trent Johnson wasn't completely satisfied with his team's performance Friday night, but TCU's new coach said he knows his team is still learning. And so is he.

"Everything for them has been new," Johnson said. "A whole new system -- everything has been teaching. I'm getting accustomed to them as much as they're getting accustomed to me."

Amric Fields scored a game-high 16 points, and Garlon Green brought down seven rebounds, as TCU overcame a slow start to beat Cal Poly 53-46 and give Johnson his first career win with the Horned Frogs.

"The bottom line is, we found a way to win the game," Johnson said after his team's season opener. "One of the things that I addressed to them is that we'll win our share of close games this year, and finding ways to win is important."

The Frogs trailed 21-20 at halftime after being held to just one field goal through the game's first 12 minutes. A dunk by Fields, a 3-pointer by Nate Butler Lind and a pair of jumpers from Green narrowed the Mustangs' early lead.

After halftime, Green, who finished with 10 points, made a pair of free throws with 17:54 left to put TCU up 24-23. The Frogs wouldn't trail again.

Kyan Anderson made three 3-pointers in the second half to finish with 11 points for the Frogs. Jarvis Ray scored seven points in his fourth career start.

After shooting 8 of 22 from the field in the first half, the Frogs shot 47 percent the rest of the game.

Still, the win didn't leave the Frogs with a good feeling, which Johnson said he's happy about.

"There's a disposition about this group that I feel really good about in terms that they're not happy with the way they played," Johnson said. "When we get out-rebounded at home, and we don't play like we practice, that doesn't necessarily bother me as much as it bothers all of us."

Brian Bennett led Cal Poly with 10 points and 11 rebounds. The Mustangs shot 35 percent from the field.

Cal Poly had a chance late in the game when Chris O'Brien hit a 3-pointer to get the Mustangs within one.

But Fields responded with a jumper and Anderson with a 3-pointer to extend the Frogs' lead to 49-43 with 1:22 left. Cal Poly wouldn't get closer.

"We exerted so much energy a couple times in that second half," Mustangs' head coach Joe Callero said. "We got down by eight, then we had to claw back and grind it and scratch it. I think once we got down to that point where it was a one point game, I think at that point we ran out of gas."