That's a change for Gostisbehere, who previously has had defensive-minded partners: Andrew MacDonald, Brandon Manning and Robert Hagg.
"I've just got to be careful," Gostisbehere said. "I jump up in the play a lot and so does he. If I see him going up there, I can't be too excited to get there too. We've got to have one guy back. That's the biggest adjustment. When I was with [Hagg], I was the first guy jumping. When I know [Provorov] can, that also conserves my energy a little bit. I can play both ends just as well."
Gostisbehere's teammates have noticed his development in all areas.
"He's just really smart positionally," forward Wayne Simmonds said. "Might not be the biggest guy, but he's probably got one of the best sticks in the League. Not much gets through him. And he usually stops the play before it even gets into the defensive zone. That's pretty good defense, if you ask me."
Gostisbehere never will be a physical force in the defensive zone, but he has been more aggressive. He has 43 hits through 62 games, matching his NHL best set in 76 games last season. He also has 84 blocked shots, putting him on pace for 106, which would be a new personal best, topping the 94 he had last season.
He's breaking up more plays in the neutral zone and using his speed, smarts and quick stick to contain opponents.
"I try to play it like if I was on the other side of that puck, what I wouldn't want a defender to do to me and that's (take away) time and space," Gostisbehere said. "I'm more lethal with time and space. I can have time to crank up and get some speed. If I don't allow other guys to do that it's going to be tough for them to play better offense against me."