The annual pay-per-view lineup for International Fight Week is filling up slowly but surely. The most recent addition to UFC 303 is a middleweight bout between Joe Pyfer and Marc-Andre Barriault , the promotion announced Wednesday. The event takes place June 29 at T-Mobile Arena in Las Vegas and is headlined by Conor McGregor vs. Michael Chandler . Pyfer (12-3 MMA, 3-1 UFC) aims to rebound from his first promotional loss