Thunder forward Kevin Durant has been ruled out of tonight's game at Boston. Durant sustained a sprained ankle Wednesday against Houston. Second-year guard James Harden will start in place of Durant. It is Harden's first career start. Durant continued to play through the discomfort but the injury eventually worsened. â€œAfter the game, I think it got worse,â€ said Durant, the leagueâ€™s leading scorer at 28 points per game. â€œMaybe I should have come out in the first quarter. But I just wanted to help my team win. And I felt if I was on the floor I was helping my team.â€ Thunder forward Jeff Green has also been ruled out for Friday. Green has missed five of the past six games while nursing his injury. The Thunder is being cautious with Durant, who underwent an MRI test Thursday, the results of which were negative. Durant also wore a protective boot Thursday, but he said it was more to alleviate discomfort. â€œI woke up (Thursday) morning and it was very stiff. I couldnâ€™t walk,â€ Durant said. â€œBut it felt a lot better this morning.â€ Durant said he iced his ankle â€œthree or four timesâ€ Thursday night and twice Friday morning. â€œIâ€™m moving in the right direction,â€ Durant said. â€œI got to be smart about it. I donâ€™t want to come in and play through pain and make it worse. Of course I want to play, but Iâ€™ve got to listen to the training staff and do whatâ€™s best for my body.â€ Oklahoma City carries a 7-4 record into TD Garden tonight against a Celtics team that currently is atop the Eastern Conference standings at 9-2. Led by Durant, the Thunder clinched a 109-104 victory in its only visit to Boston last season. But the Celtics routed the Thunder in the teamâ€™s first meeting this year, leading by as many as 22 points before winning 92-83 on Nov. 7.