I'm not sure what you want. . English does not have that construct. Rod is able to play tennis. Rod knows how to play tennis. . Rod is currently playing tennis. . can play is playing . can do is doing . can teach is teaching . Would you like someone to name these constructions for you? Would that make it easier to remember? Or easier to look them up? Maybe check out "gerund" and infinitive. Sometimes it's just a matter of practicing the constructions, until they become natural to you. You can practice this. Soon practicing this will be natural. You can repeat this. Soon repeating these will feel natural to you. You can do this. Soon you will be doing this, naturally.

Because it's simple present, if playing was the answer then it would be present progressive and wouldn't sound correct.

check the usage of can