Novak Djokovic has been working on his jumper, and LeBron James has taken notice.

Djokovic, the No. 1 men's tennis player, issued a tongue-in-cheek Twitter challenge to James on Saturday as he showed off his hoops handles and hit nothing but net from the elbow.

The four-time NBA MVP seemed impressed and deemed Djokovic ready for a one-on-one.

We might need to see a highlight reel of Djokovic's defense before he tries to take on the Los Angeles Lakers superstar.