TUF 17 champion Kelvin Gastelum will be fighting..

TUF 17 middleweight champion Kelvin Gastelum will drop to welterweight and fight Paulo Thiago at the second UFC on FOX Sports 1 event on Aug. 28, 2013

Source: http://www.mmamania.com/2013/6/4/4395572/ufc-164-kelvin-gastelum-drop-welterweight-paulo-thiago-indianapolis-mma

Is this the toughest first non-TUF fight for a TUF winner ever?

I know there are some that turned out to be tough, but is this the toughest one (on paper) yet?

Thiago is no joke!

Kelvin UD