It was a day of upsets at the Delray Beach Open as Jack Sock, John Isner and Milos Raonic crashed out.
Jack Sock kicked off the defence of his Delray Beach Open title with a win while Hyeon Chung also advanced.
The ATP have ruled that there was "no evidence" that Ryan Harrison racially abused Donald Young.
The ATP will probe "allegations of racial prejudice" after Donald Young-Ryan Harrison incident.
Things turned nasty between Donald Young and Ryan Harrison at the New York Open and continued on Twitter.