Panik 7-day DL candidate

MIAMI — Joe Panik took it easy Monday. A day after he got hit hard at the plate, he took more vision and balance tests and passed them all.

He said he’s day to day and doesn’t know when he’ll play next. The Giants might make that choice easy for him. They’re considering placing the second baseman on the sevenday concussion disabled list as soon as Tuesday.

Panik was knocked down in the doubleheader nightcap in Washington on Sunday as he tried to score. The ball thrown from the outfield plunked him on his head right as Nationals catcher Matt Wieters applied the tag to the head.

Panik, who seemed dazed after the play but stayed in the game, had a scheduled day off Monday anyway, manager

Bruce Bochy said. Considering Panik’s concussion issues in 2016, the Giants need to be especially cautious. The likely roster replacement would be Orlando Calixte, who was the Giants’ 26th man for Sunday’s doubleheader.

Panda hacks: Pablo Sandoval’s right-handed hitting (3for-25 on the season, 0-for-5 as a Giant) hadn’t been spectacular, but Bochy put the third

baseman in the lineup with the Marlins starting a lefty, Adam Conley.

If Sandoval truly is part of the Giants’ future, they need to see whether he can produce from the right side. For his career, he’s a .294 hitter from the left side, .257 as a righty.

In his first at-bat Monday, Sandoval hit an opposite-field single to begin a three-run rally.

“He had some good swings. His swing was fine,” said Bochy, noting he liked Sandoval’s right-handed swings against Nationals lefty Sean Doolittle on Sunday.

Briefly: Matt Cain will start Wednesday. With the doubleheader, the Giants needed someone to make a spot start, and the choice was Cain over

Albert Suarez, who threw 27 pitches Sunday . ... Johnny

Cueto played catch in the outfield again and soon will throw his first bullpen session since suffering an elbow injury.