Roki Sasaki brought the heat.

He just didn’t have the command.

The 23-year-old Japanese phenom and newest Dodgers star hit 101 mph but lasted just three innings in his MLB debut Wednesday in a 6-3 win over Cubs in the Tokyo Series.

Sasaki allowed one run on one hit while striking out three, but walked five over 56 pitches before turning over a 5-1 lead to the Dodgers’ bullpen.

“I was nervous, but I really wanted to make sure I made the most of this unique experience and tried to do my best,” Sasaki told MLB Network through a translator. “I was nervous, but in a way it really helped me concentrate and really helped me live in the moment.”

Few pitchers entered their first MLB start with the buzz that Sasaki did after he emerged as an ace in Japan’s Nippon Professional Baseball league.

MLB teams fought for the opportunity to sign the young, gas-throwing righty this offseason, especially since he did not command a large contract due to him being posted rather than being a true free agent.

The Dodgers, like they seemingly do with every free agent, emerged victorious in the courting process and added another star to their rotation.

Sasaki immediately showed why teams salivated at the chance to add him by throwing three 100-mph fastballs to Ian Happ to begin his career and he hit 101 mph with his fourth offering.

After a perfect first frame, though, Sasaki’s command eluded him.

He walked two batters in the second inning and then issued three free passes in the third inning, including a bases-loaded free pass to new Cubs star Kyle Tucker that sliced the Dodgers’ lead to 5-1.

Sasaki rebounded to strike out Michael Busch and Matt Shaw to avoid further damage.

He painted a 98-mph fastball to put away Busch and used an 86-mph slider below the zone to induce a whiff from Shaw.

Dodgers manager Dave Roberts said Sasaki wanted to stay in the game, but he made the decision to pull him since he felt it served in the best interest of the pitcher.

“Just the way he responded in that situation, when he didn’t have his best command tonight, I just think it speaks to how competitive he is,” Roberts said.

“That was a pivotal part of the game and he’s just such a great competitor.”

Sasaki primarily relied on his fastball Wednesday, throwing 37 (66.1 percent), while using his splitter as his primary secondary offering.

He induced five swing and misses.

“I felt good, I felt like I was able to find some good mechanics and delivery that really works for me,” Sasaki told MLB Network after recording a no-decision. “It (would’ve) helped to be able to do that in the second and third inning as well, but the first one was good.”

The Dodgers’ bullpen allowed just two runs over six innings to sweep this brief two-game set, with Shohei Ohtani, Tommy Edman and Kike Hernandez also homering.

“The fact the team was able to win two games is really good,” Sasaki told MLB Network. “I hope I can throw more innings and really contribute to this team.”