WASHINGTON — Alex (All Series, Baby, All Series) Ovechkin hasn’t scored since Game 2 of Round 2 against the Rangers, but that didn’t stop No. 8 from issuing a guarantee for Wednesday’s Game 7 at the Garden following his team’s 4-3 Game 6 home defeat Sunday.

“We’re going to play our game and we’re going to come back and we’re going to play Montreal or Tampa [in the conference finals],” said the Washington captain, who has never advanced beyond the second round in his 10-year career and whose franchise has not reached the conference finals since 1998.

The Caps have now blown 10 two-game leads in their franchise history. They have lost the first nine of those series.

Ovechkin, who had six shots on 12 attempts, was foiled by Henrik Lundqvist right out in front in his bid to tie the match with 5:45 remaining and the Caps swarming the Rangers’ zone and storming the net in an effort to overcome an early third-period deficit.

The Capitals captain, who scored in each of the first two games, and uttered the “All series, baby, all series” declaration when skating by Lundqvist after scoring on a left-wing rifle late in the first period of Game 1, has 27 shots on 59 attempts in the series.

“We almost tie the game and the character of this group, it shows a lot,” Ovechkin said. “We’re going to come back and win the series.”

Wednesday will mark the third Game 7 between these teams in the last four years, with the Blueshirts having taken the 2012 second round with a Game 7, 2-1 victory at the Garden a year before taking the 2013 first-round with a 5-0 rout of the Caps in D.C.

There were no guarantees issued before either of those matches by any of the Rangers, just as there were none Sunday night in the New York room.