Melbourne - Former Grand Slam champion Lindsay Davenport's protege Madison Keys
won her all-American clash with Madison Brengle in straight sets on
Monday to cruise into the Australian Open quarter-finals.
world number 35 Keys downed Brengle 6-2, 6-4 to set up a last eight
clash with either fellow American Venus Williams, seeded 18, or Polish
sixth seed Agnieszka Radwanska.
The 19-year-old, who upset fourth
seed Petra Kvitova in the third round, started working with Davenport
last year and said she felt her game had matured in the off season.
"I think I've matured a little bit and just got my game together a little bit more. It's kind of just come together," she said.
has long been touted as the rising star of American tennis and 18-time
Grand Slam champion Serena Williams, the top seed at Melbourne Park,"
said she was thrilled to see the teenager fulfilling her potential.
a great girl, she has such a great spirit about her," Williams said.
"She does everything really well. She just has so much unbelievable
potential and she's so young. It's so good to see her doing so well."
admitted it was difficult facing world number 64 Brengle, a close
friend who she keeps in constant contact with, including sending each
other jokes about sharing the same first name.
"It's always hard
playing a friend, it makes it a little bit more of a challenge but I
wanted to come out and play well and I'm in the quarters," she said.
started strongly with a game-plan slightly tweaked from her earlier
rounds, going to the net instead of simply relying on powerful strokes
from the baseline.
She raced through the first set in just 23
minutes and scored an early break in the second before Brengle responded
with a break of her own.
By then it was too late and the main obstacle Keys faced were her nerves when she brought up three match points.
wasted the first with a double fault, hit her forehand long on the
second but finally sealed the win when Brengle netted her return on the