First off... the typography is awful. The 'fire' thing is weird. If you want my honest opinion, I'd give it a 1 out of 5.

Secondly, try using 'green', remove that 'fire' thingy, make sure there's a bit more detail on the tennis racquet... It's a tennis club, right? So, let's be realistic. It's not 'Anime' tennis cartoon... that's for sure.

Tips.
Try to design something in Black & White first. If you can achieve something in B&W, then you can slowly add in colors to it.

Also, maybe you can try merging the tennis racquet, tennis ball and the tennis court together. Check them both out in terms of shapes, lines, etc. See if something 'links' between them.