Frank has a new coach. Maybe this will turn things around. Leonardo Lavalle of Mexico will start working with him in two weeks.
Lavalle, 41, won the Wimbledon juniors boys' title in 1985 and is probably one of the best players ever to come out of Mexico. He represented his country in Davis Cup for 15 years (3-1 against Canadians in two ties - beating Andrew Sznajder, Sébastien Lareau and Stéphane Bonneau, losing to Martin Wostenholme).
He reached a high of No. 51 in singles (in 1986) and No. 23 in doubles (in 1992) in about a dozen years on the ATP Tour. He reached the round of 16 at the 1989 Australian Open, and the third round of the French Open that same year. In doubles, he had two semi-finals at the French Open, and went semis-semis-finals at Wimbledon from 1989-91. He also was a quarter-finalist at the 1992 Olympics in Barcelona.
I think that he is at the time of tactically and technical changing. It thinks while challenging for the leap in the future if it is not possible to win so that even the challenger may win if it does usually.