There really was no need for anything other than Plan A in the early going in front of a Centre Court crowd that included actors Tom Cruise, Kate Beckinsale and Hugh Jackman.

Paolini did try to shake things up a bit, with the occasional serve-and-volley rush forward or drop shot, but she couldn’t solve Krejcikova. Not yet, anyway.

After the lopsided first set, Paolini went to the locker room. She emerged a different player, one who no longer looked like someone burdened by residual fatigue from the longest women’s semifinal in Wimbledon history, her 2-hour, 51-minute win over Donna Vekic on Thursday.

Paolini had come back from dropping the first set in that one, so she knew she had it in her. And she began the second set against Krejcikova in style, delivering deep groundstrokes and grabbing a 3-0 advantage.

Once the match was tied at a set apiece, it was Krejcikova who left the court to try to recalibrate.

Her shots that suddenly went so awry in the match’s middle — after four unforced errors in the first set, she made 14 in the second — were back to being crisp and clean.

At 3-all in the deciding set, it was Paolini who faltered, double-faulting for the only time all afternoon to get broken.

Krejcikova then held at love for 5-3, but when she served for the championship, things got a little tougher.

She needed to save a pair of break points and required three match points to get across the finish line, winning when Paolini missed a backhand.