With his team trailing by four points through three quarters Tuesday night against the Sacramento Kings, Thunder coach Scott Brooks said he wasn't sure if he would stick to his original plan and sit his starters the entire fourth period. Reserve shooting guard Daequan Cook and his fellow reserves didn't give Brooks a choice but to leave in the backups as OKC recorded a hard-fought 118-110 comeback victory over the sizzling Kings at Chesapeake Energy Arena. Cook erupted for 19 points, all in the fourth quarter, as the Thunder's second unit slammed the door by outscoring Sacramento 36-24 in the final period. Cook shot 6 for 9 in the fourth quarter, burying 4 of 5 from 3-point range. The dagger came on a 3-pointer from the right corner with 44.9 seconds left to give the Thunder a 114-107 lead. “I was in a great rhythm,” Cook explained afterward. “I felt pretty good out there. Guys were getting me looks and I was knocking them down.” While the Kings stuck with their starting lineup until Cook's dagger, the Thunder countered with a lineup of Cook, Nick Collison, Derek Fisher, Cole Aldrich and Royal Ivey for the entire fourth quarter. No Sacramento starter played fewer than 33½ minutes in the game and no OKC starter played more than 32½ minutes. The difference-maker and tide-changer no doubt was Cook, who admitted he has been slow to recover from the mild right MCL sprain that caused him to miss six games starting on March 21. Asked if he was 100-percent healthy, Cook said: “Not really. (I'm) still kind of going through the motions, but it's not affecting me in any way. I'm still getting treatment, still doing the things I need to do to get there, but it's not stopping me from playing.” Exactly what percent is Cook health-wise? “I couldn't tell you,” Cook said, before smiling and adding, “but after tonight I feel a little better.” Aldrich, the Thunder's third-string center, normally is doing leg kicks from the bench whenever a teammate hits a 3-pointer. On this night, he was on the court to admire Cook's display up close. “Unreal,” Aldrich said of Cook. “It was fun. I wasn't on the sidelines doing my leg kick. I was hoping someone else was doing it for me.” Aldrich helped seal the game by going 4 for 4 from the free-throw line in the final 35.5 seconds. Recently acquired guard Derek Fisher directed the second unit and finished with 11 points and five assists. As for the starters, Thunder All-Star Kevin Durant started the game 3 for 3 from the field, but then hit just 4 of his final 16. Despite misfiring from the field, Durant maintained his slight lead over Los Angeles Lakers guard Kobe Bryant for this year's scoring title thanks to going 15 for 16 from the free-throw line to end with 32 points in 32½ minutes. The Thunder was without its top reserve in pending Sixth Man of the Year James Harden, who sat out due to a concussion he suffered Sunday after getting hit by the elbow of Lakers forward Metta World Peace, who received a seven-game suspension. “He's a big factor on our bench, not just our bench but our whole team,” Cook said of Harden. “Those guys (on the bench) had to step up big and we all did a great job playing our roles and doing what we needed to do to get the win.” Sacramento wound up shooting 52.4 percent for the game, but shot an astounding 81.8 percent from the field in the first quarter, making 18 of 22 attempts to take a 40-35 lead. Needless to say, it was the most points and highest shooting percentage given up by the Thunder this season. The Kings didn't cool off any early in the second quarter, pushing their lead to 50-37 at the 9:43 mark thanks to 77.8-percent shooting (21 for 27). The Thunder stormed back quickly and pulled to within 52-51 at the 4:18 mark and managed to stay close until the fourth quarter, when Cook and his fellow reserves took command.