The play of Rajon Rondo, even with an injured ankle, has been the difference in the Celtics-Bulls series so far, and Chicago are now looking at new ways to stop Boston's dynamic point guard, the Chicago Sun-Times are reporting.

''We couldn't control Rondo at all,'' Bulls coach Vinny Del Negro said. ''We may look at some different things. We have to do a better job of executing our game plan, and then we can make changes on it. Turnovers are getting him in the open court, where he's really good. He's attacking us on the break.''

Rondo raised eyebrows when teammate Bill Walker carried him to the locker room after the Celtics' 107-86 win in Game 3, in which he had 20 points, 11 rebounds, six assists and five steals at the United Center. But Rondo said he had not reinjured his ankle.

''I was limping, and Billy didn't want to see me limp, so he just carried me,'' Rondo told the Boston Globe. ''I didn't slip or nothing. I'm fine. Ankles are fine. Maybe the tape was too tight.''