Russian qualifier Varvara Gracheva overpowered fourth-seeded Ons Jabeur of Tunisia 6-2, 6-2 on Friday in the second round of the Miami Open.
Jabeur, who is ranked fifth in the WTA, twice sought assistance from the training staff. She has been slowed by a knee injury this year, perhaps playing a role as Gracheva beat a player ranked in the world top five for the first time.
