INDIANAPOLIS -- Jrue Holiday overcame an illness to convert the go-ahead three-point play with 38 seconds left, then make the game-saving steal to help the Boston Celtics rally from an 18-point deficit to beat the Indiana Pacers 114-111 on Saturday night for a 3-0 lead in the Eastern Conference finals.

Boston can clinch its second NBA Finals trip in three seasons with a Game 4 win Monday in Indianapolis.

Jayson Tatum had 36 points, 10 rebounds and 8 assists. Jaylen Brown added 24 points and Al Horford had 23 points and seven 3-pointers as the Celtics won their sixth straight playoff game and stayed unbeaten on the road this postseason.

Horford's seven open 3-point makes are tied for the most by any player in a playoff game in the last 10 postseasons, according to ESPN Stats & Information research.

Holiday played despite being listed as questionable with an illness unrelated to COVID-19.

Andrew Nembhard led the Pacers with a career-high 32 points before Holiday stole the ball from him with 3.3 seconds remaining. T.J. McConnell finished with 23 points, nine rebounds and six assists, while Myles Turner and Pascal Siakam each had 22 points.

Indiana played without All-NBA guard Tyrese Haliburton, who sat out with a left hamstring injury, and certainly missed him as Boston closed the game on a 13-2 run. It's the first loss in seven postseason home games for the Pacers.

The Associated Press contributed to this story.