The idiom "than one's teammate" means that someone is better or more skilled than their fellow player on a sports team.
Sentences with «than one's teammate»
So I spent a lot of time studying my opponents, maybe more so than my teammates. (sciencemag.org)
Mansell registered a lap time that was two seconds quicker than his teammate Ricardo Patrese, who in turn was a second quicker than Ayrton Senna in the McLaren. (wtf1.com)
That's right, in one week oddsmakers have concluded that Ohtani is better than his teammate Mike Trout. (actionnetwork.com)