Madrid - Caroline Wozniacki has set up a third round meeting with Agnieszka Radwanska at the Madrid Open on Monday as her promising start to the clay court season continued with a 7-5, 6-0 win over American qualifier Christina McHale.
The world number five reached the final in Stuttgart last month and had too much for McHale after battling back from 4-2 in the first set.
Radwanska had an even more comfortable route into the last 16 as she needed just over an hour to dispose of Australian Casey Delacqua 6-2, 6-1.
The Pole is playing her first tournament since ending an ill-fated four-month spell with 18-time Grand Slam champion Martina Navratilova as her coach.
Wozniacki leads the head-to-head between the pair 7-4, but this will be their first meeting on outdoor clay.
There will also be a battle of former US Open champions in the last 16 as veterans Samantha Stosur and Svetlana Kuznetsova face off.
Kuznetsova battled past home favourite Garbine Muguruza 6-3, 5-7, 7-5 after over two-and-a-half hours on court, whilst Stosur eased past Estonia's Kaia Kanepi 6-3, 6-2.
Big-serving Americans John Isner and Sam Querrey also booked their places into the second round of the men's event on Monday.
Isner overcame France's Adrian Mannarino 7-6 (7/2), 6-4, whilst Querrey edged past Australian qualifier Thanasi Kokkinakis 6-4, 6-7 (5/7), 6-3.