Mehrtens added a bright spot to a tough week with an impressive victory at Hāwera on Saturday.
Ridden by Mereana Hudson, the 6-year-old son of Pins raced on the pace throughout in the Carrfields Livestock 1400 and kicked clear of his challengers in the straight to win by three-quarters of a length.
It was the fifth win of a 20-start career for Mehrtens, who is trained by Suzy Gordon at Foxton. Gordon also shares ownership alongside John Bradley, Sharon Townshend, Pauline McGuigan and the gelding's breeders, Goodwood Stud.
Goodwood owner William Fell is married to popular jockey Rosie Myers, who is in an induced coma at Wellington Hospital following a freak accident at Tuesday's Foxton trials.
After winning a trial aboard an unnamed runner from the Gordon stable, Myers was dislodged when her mount veered sideways after the finish line. A rival runner then made contact with her head.