Constantin Ursu’s first defense of his Commonwealth welterweight title against Ryan Amos has been postponed due to a biceps injury, according to a social media post by Amos’ manager, Scott Calow.

Ursu-Amos was supposed to headline on May 25 at York Hall in London, main-eventing a show streaming on DAZN. The Top Tier Boxing promotion will still go forward on that same day and venue, but with a new main event: a super middleweight bout between James Osborne, 8-1 (1 KO), and Liam Forrest, 3-0-1 (0 KOs).

Ursu, 13-0 (6 KOs), won the vacant Commonwealth belt in March with a seventh-round knockout victory over the 13-1 Eithan James.

Amos, 15-2-2 (2 KOs), has won two straight against gimme opponents since losing on points to the 8-1 Bilal Fawaz last October.

“Amos will have a fight on July 5 to keep busy on a show which will also include another five of our boxers,” Calow posted on social media.

David Greisman, who has covered boxing since 2004, is on Twitter. David’s book, “,” is available on Amazon.