Flip two of the head to heads, and we tie the Barves at 95 wins.
The ones that got away:
June 22 - 13-9. Rosenthal, Ross, Grace team up to spit the bit. Anibal somehow survives 6 innings and leaves with an 8-4 lead. Rosenthal has I think his final disaster - 3 runs, no outs - and, along with Rainey, allow ATL to tie it up in the 7th. Nats go on to grab a lead in the bottom of the inning, only to see the Barves get to Ross for 4 in the 8th. Grace graces the Barves with another gratuitous run in the 9th.
https://www.baseball-reference.com/boxes/WAS/WAS201906220.shtmlJuly 19 - 4-3. After trailing 3-1 into the 9th, Nats tie it up with a 2 run rally. Davey elects to bring Rodney back out for a 2d inning of relief. Walk, single, walk, single.
https://www.baseball-reference.com/boxes/ATL/ATL201907190.shtmlJuly 31 - 5-4. Nats rally late with 1 in the 8th and 2 in the 9th to tie the game 4-4, only to have Doo give up a dinger to Donalson in the top of the 10th.
https://www.baseball-reference.com/boxes/WAS/WAS201907310.shtmlThe series from 9/5 to 9/8 deserves a mention, not for blown leads but for 3 straight late-inning comebacks that ended 1 or 2 runs short.