WASHINGTON — The Washington Nationals breathed a sigh of relief after tests revealed good news about their star outfielder. Bryce Harper has a “significant bone bruise” in his knee but no ligament damage, general manager Mike Rizzo told reporters Sunday. 

Harper was injured while running out a ground ball in the first inning Saturday, twisting his knee as he touched first base.

“We feel we dodged a bullet,” Rizzo said. “We’re optimistic we’ll see him this season.”

Rizzo last saw Harper at 2:30 Sunday morning and said the All-Star outfielder was eager to undergo an MRI. He was encouraged when Harper walked up the clubhouse stairs without assistance.

Harper, 24, was having another MVP-caliber season in driving the Nationals to a 69-45 record and 14 1/2-game lead in the National League East. He’s slugged 29 home runs and his .326/.419/.645 slash line is second only to his 2015 MVP season, when he slugged a career-best 42 home runs. 

He’s expected to command a major league record…