Koko's US Open title defense came to an end on Monday as she was beaten by Emma Navaro Nick kgos has stepped up to offer his mentorship to KOCO go following her unexpected exit from the US Open where she bowed out in the fourth round while trying to defend her title The Young American tennis sensation couldn't replicate the outstanding performance of the preceding year falling short against fellow countrywoman Emma Navaro do the match saw G's hopes for a consecutive US Open win dashed as Navaro clinched the crucial sets with scores of 63 4 to 663 thereby sec during her place in the quarterfinals against Spain's Paula Bosa it proved to be a day golf would rather forget marred by 19 double faults 11 of which occurred during the deciding third set and peppered with 60 unforced errors against a meager tally of 14 winners dot despite the disappointing show golf did stage a comeback by snagging the second set after succumbing to defeat in the first yet Navaro capitalized on every slip up in what can only be described as an off performance at Flushing Meadows demolishing G's aspiration of defending her title do reflecting on the loss the downhearted 20-year-old confessed that Navaro was the rightful Victor on the day stating mentally and emotionally I gave it my all but there's things execution wise where obviously I wish I could serve better I think if I would have done that it would have been a different story for me in the match