Thunder starting center Kendrick Perkins suffered a right hip strain at the 4:09 mark of the first quarter on Saturday and did not return. Pending further evaluation, his status is day-to-day. “We'll evaluate it tomorrow and see how he feels,” OKC coach Scott Brooks said after his team's 103-97 victory to clinch its first-round playoff series 4-0 against the defending world champion Dallas Mavericks. Perkins' absence led to more playing time for Nazr Mohammed, who did not play the first two games of the series and had seen only five mop-up minutes at the end of Game 3. Due to matchup problems against Dallas, Mohammed played just two of five games in the Western Conference Finals against the Mavs last season and seven total minutes. “This series was a tough series for him to get minutes,” Brooks said. Mohammed started the second half, and the Mavs wound up outscoring OKC 34-21 in the period to take an 81-68 lead heading into the fourth quarter. Mohammed left at the 7:46 mark of the third period and did not return. He finished with four points, two rebounds, two turnovers, four fouls and was 2 for 3 from the field. THUNDER FANS Roughly 1,500 Thunder fans made their presence known at Game 4 on Saturday night at American Airlines Center, with many lingering outside the arena 2 1/2 hours before tipoff. During pregame introductions before Game 3, Thunder starters — particularly Kevin Durant and Russell Westbrook — were greeted with resounding boos. But on Saturday, cheers easily overwhelmed boos, and it continued throughout the game. During a game delay with 38.8 seconds remaining and OKC leading 100-95, Thunder fans began a chant of “O-K-C.” After about 30 seconds, Dallas fans mustered enough volume to drown out the visitors’ chant with “Let's go Mavs.” GIMME A HUG In a series that featured some combative words, pushing, shoving and posturing, all seemed forgiven when the final buzzer sounded. Dallas forward Dirk Nowitzki sought out as many Thunder players as he could find on the court afterward, offering congratulations and pats on the back. Mavs coach Rick Carlisle and Thunder coach Scott Brooks opened their postgame remarks with glowing remarks about the opposing team. SIGN HIM, SAM Carlisle also complimented Thunder general manager Sam Presti on his work, but sent out a warning. “Scott Brooks (is) one of the best coaches in the game,” Carlisle said. “I hope Sam's got enough money to sign him, because he's going to be in high demand if they don't get that done.” Brooks is in the final season of his three-year contract. Coincidentally, Carlisle also is unsigned. TIP-INS Seated front row at midcourt was former Dallas Cowboys quarterback Troy Aikman, who was clearly cheering for the Mavericks despite once hailing from Henryetta and playing two years for the Oklahoma Sooners. … With 5:07 left in the first quarter Saturday, the Mavericks took their first lead since Game 2. The Thunder led wire-to-wire in its 95-79 victory in Game 3 on Thursday. … In Game 2, OKC converted 37 of 39 (.949) free throws. In Game 3, it made just 11 of 17 and began Game 4 making 1 of 3, for a stretch of 12 for 20 (.600). The Thunder finished 16 for 20 (.800) in Game 4. … During one stretch, OKC went with a lineup of Westbrook, James Harden, Derek Fisher, Daequan Cook and Nick Collison against a Dallas lineup that included 7-footers in Nowitzki and Brendan Haywood. UP NEXT There is no way to know when the Thunder's second-round series against the Los Angeles Lakers-Denver Nuggets series will begin, but the earliest it would begin is Saturday at Chesapeake Energy Arena. QUOTABLE Harden, who had 15 points in the fourth quarter to help lead the comeback victory: “Well, we had a bad third quarter, going down 13, especially late in that third quarter. And usually we crumble, but we didn't crumble at all. In the fourth quarter we picked it up and just everybody made plays.” QUOTABLE II Dallas sixth man Jason Terry: “Not our year. Take your hat off to them. They're a good young team. The balls were definitely bouncing their way. All season they played well. You have to give them credit for everything they did tonight.” SIXTH STARTER After his team's shootaround Saturday morning, Terry said: “We're going to push the envelope (tonight), whatever that means. We're going to go after it, man. I mean, what else do you have to lose? Do you want to end your season now and go on vacation, or do want to keep playing? I've got a lot of basketball left in me and I want to continue to play.” Perhaps what Terry was referring to was him joining the starting lineup in Game 4 after starting just one regular-season game this year. Saturday potentially could have been Terry's last game with the Mavs. In his 13th season out of Arizona, Terry becomes an unrestricted free agent this summer.