WASHINGTON — Reserve Rebecca Allen hit four three-pointers and finished with 19 points — both career highs — as the Liberty bench scored a WNBA-record 69 points in a 88-81 win over the Washington Mystics on Wednesday.

Brittany Boyd had 17 points and seven assists, Amanda Zahui B. added 15 points and nine rebounds and Shavonte Zellous scored 14 for the Liberty (18-7). The Liberty’s starters scored just 19 points — including 13 by Tina Charles — to tie the WNBA record for fewest by starters in a win.

The Mystics’ bench scored 63 points in a triple-overtime win against the Los Angeles Sparks on June 1, 2014. The previous record in a non-overtime game was held by the Liberty, when its bench scored 62 points in a 105-72 win over the Phoenix Mercury on June 22, 2008.

Allen came into the game averaging 3.6 points in 11 games. Her previous high this season was 11 points in 18 minutes in an 86-82 win over the Atlanta Dream on July 13. Allen was re-signed by the Liberty on June 21 after spending the first 12 games away from the WNBA while trying to earn a spot on the Australian Olympic team.

Emma Meesseman’s jumper capped an 11-3 run that pulled the Mystics within four with 1:45 to play, but Boyd hit Kiah Stokes for a layup to make it 87-81 a minute later. A steal by Boyd, her third of the game, on Washington’s next possession sealed it.

The Liberty used an 18-2 run to take a 35-27 lead with four minutes left in the first half and led the rest of the way.

Meesseman led the Mystics (9-14) with 20 points. The Mystics made 11 of 22 three-pointers and the Liberty finished 7 of 12.

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The Liberty, in third place overall in the WNBA standings behind the Los Angeles Sparks and Minnesota Lynx, play again on Thursday morning at Madison Square Garden against Tamika Catchings and the Indiana Fever. That will be the final game for the Liberty before the league takes a month off for the Summer Olympics in Rio.