If NBA stars were FIFA World XI players 

Central Defensive Midfielder: Kawhi Leonard

San Antonio Spurs' Leonard

The Klaw is a 2x DPOY and 1x Finals MVP; arguably the best two-way player in the NBA. Combining his physical tools and tough mentality, Leonard has an extremely high motor and IQ on defense that makes perfect for his position at defensive midfield.

Like candy from a baby:

Similarities: Casemiro (Real Madrid)

Casemiro against Barcelona

Just like Kawhi Leonard, Casemiro's playstyle is seen as unfashionable, boring yet impeccable and indispensable to Real Madrid's success.

Both players are the spearheads in defense of their respective teams ( SA Spurs and Real Madrid ) and help their teams concede far fewer points/goals than they might have done.

To put it in another context, reliability, physicality, consistency, and tenacity combined with his technical prowess is what makes both Leonard and Casemiro tick.