Bernard Tomic plans to appeal any possible fine levelled against him for coaching in his second-round loss at the ATP/WTA event in Miami.
The Australian teenager was cautioned in his 6-4, 6-4 loss to Spanish fifth seed David Ferrer at what is one of the ATP's prestigious Masters 1000 tournaments, but claimed he was merely asking his coach-father John to have some racquets restrung.
A distracted Tomic then asked his father to move so he was not warned again before explaining himself to the chair umpire.
Meanwhile, Roger Federer set up a 24th career meeting against old rival Andy Roddick as both eased through the second round.
Third-seeded Federer, who has a 21-2 record against world number 34 Roddick, recorded his 23rd win of 2012 by beating 19-year-old American wild card Ryan Harrison 6-2, 7-6 (7-3).
The Swiss superstar is bidding to capture his third Indian Wells-Miami title double, having also won the back-to-back US hardcourt Masters events in 2005 and 2006.
Federer has now won 40 of his past 42 matches since the 2011 US Open semi-finals.
Roddick, the number 31 seed and 2004 and 2010 champion in Miami, dropped nine points on his serve and hit 10 aces to beat Luxembourg's Gilles Muller 6-3, 6-2.
The American, who is at his lowest ranking since July 2001, won in 74 minutes.
In the women's event, former world number one Kim Clijsters lost 6-4, 7-6 (7-5) to Belgian compatriot Yanina Wickmayer, the 23rd seed, in the third round.
Clijsters saved three match points but appeared to suffer a recurrence of her ankle injury.
American 10th seed Serena Williams breezed into the fourth round with a 6-2, 6-1 win over Italian number 21 seed Roberta Vinci.
Williams, who is playing her first tournament since a fourth-round exit at the Australian Open, will face either Australian sixth seed Samantha Stosur or South Africa's Chanelle Scheepers for a place in the last eight.
AAP/AFPTags: tennis, sport, united-states First posted March 25, 2012 07:17:10