CHICAGO (CBS) – The Celtics blew a 20-point lead but bounced back to even their series with the Chicago Bulls with a 104-95 win on Sunday night.

Chicago came storming back from the deficit to take a third quarter lead. But Isaiah Thomas had 10 points in the third to help Boston regain momentum and go on to take Game 4 and in turn knot the best-of-seven series at 2-2.

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Thomas finished the night with 33 points. Al Horford had a strong fourth quarter to finish with a double-double stat line of 15 points and 11 rebounds.

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Getting his second straight start, Gerald Green provided the Celtics with an early spark. He ended the night with 18 points.

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Boston and Chicago continue their first round series on Wednesday at TD Garden. A game time has not yet been announced.