Sept 20 (Reuters) - FedEx tightened its full-year profit forecast on Wednesday, even as it benefited from problems experienced by rivals UPS and Yellow .

FedEx now expects full-year earnings per diluted share between $15.10 and $16.60 before certain accounting adjustments, compared with the prior forecast of $15 to $17 per share. (Reporting by Priyamvada C in Bengaluru)