TURIN, Italy (Reuters) -Taylor Fritz came close to causing an upset against world number one Carlos Alcaraz at the ATP Finals on Tuesday and the American feels he should have been more clinical and taken the many opportunities he had to overcome the triumphant Spaniard.

Last year's beaten finalist Fritz played some amazing tennis in a thrilling three-set round-robin match in Turin, and after winning the opening set with a decisive tiebreak performance he could have put Alcaraz away in the second.