Isaiah Thomas scored 29 points and had 12 assists, Kelly Olynyk scored a career-playoff high 26 points and the Celtics used a big fourth quarter to outlast the Washington Wizards 115-105 in Game 7 of the Eastern Conference semifinals Monday night.

 

Led by Olynyk the Celtics got a huge lift from their bench, outscoring their Wizards' counterparts 48-5. Boston also connected on 11 3-pointers, including 8 of 13 in the second half.

Bradley Beal led the Wizards - which was playing it its first Game 7 since 1979 - with 38 points, including 24 in the second half.

 

Otto Porter added 20 points. John Wall and Markieff Morris each finished with 18. But Washington also had 15 turnovers, leading to 17 Celtics' points.

 

Boston trailed 76-72 late in the third quarter before ending the period on a 13-3 spurt . The run grew to 22-5 in the opening minutes of the fourth as the Celtics' lead became 94-81.

 

But Washington quickly responded, scoring seven straight in just 51 seconds to get back within six.

 

Washington stayed close as Beal continued to score, including a four-point play . But Olynyk then took over. He scored 11 of 13 points for Boston as the Celtics stretched their advantage to 110-100.

 

Boston advances to the Eastern Conference finals, where it will host the Cleveland Cavaliers in Game 1 on Wednesday. It's the Celtics first appearance in the conference finals since 2012.