The story of world No. 772 Marcus Willis and his rise to tennis stardom just keeps getting better and better.
His battle with world No. 3 Roger Federer on centre court at Wimbledon this morning had the crowd in a roar.
While the full-time tennis coach, part-time tennis hero, wasn't able to conjure up a victory losing in straight sets, something else has caught the eyes of keen observers.
Take a look at the left sleeve of Willis' shirt.
![Marcus Willis of Great Britain in action during his second round Wimbledon match against Roger Federer. Photo / Getty](https://www.nzherald.co.nz/resizer/v2/7N7LCSWXT3FMPGHWQXVGASDYZA.png?auth=bc25c961ac09fe7ef88dcaf418fb48c260394827815af43a0388efe17c2401cd&width=16&height=10&quality=70&smart=true)