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Miami - Andy Murray backed up a Davis Cup victory against Donald Young as he defeated the American 6-4, 6-2 on Friday to begin his campaign for a third title at the ATP and WTA Miami Masters.
Murray, seeded third, has defeated Young in five of six meetings, including last month's Davis Cup first-round date in Glasgow.
The Scot, who won titles at the town he uses as a training base in 2009 and 2013, ended with just 14 winners while striking 21 unforced errors to 32 for his opponent.
Victory took less than 90 minutes and puts Murray into the third round against either Colombia's Santiago Giraldo or Robin Haase of the Netherlands.
Murray stands 23-7 in Miami as he plays the tournament for a tenth time.
The former Wimbledon and US Open champion took a 5-1 lead in the opening set before closing it out on the first of three set points and led 5-2 in the second before lifting victory from a concluding Young forehand error.
Eighth seed Tomas Berdych followed the winning example, defeating South Korea's Chung Hyeon 6-3, 6-4 as South African 15th seed Kevin Anderson began with a defeat of American Sam Querrey 6-7 (5/7), 7-6 (7/3), 6-4.
Australian Bernard Tomic shook off effects of last week's wisdom tooth and back pain at Indian Wells which forced him to forfeit a match, coming back strong in Florida for a 7-6 (8/6), 7-5 defeat of American Austin Krajicek.
Women's third seed Simona Halep had to recover after losing the second set to earn a 6-4, 2-6, 6-1 defeat of Czech Nicole Vaidisova to reach the third round.
The Romanian, winner of the Indian Wells title, was stunned in the second set by the 25-year-old Vaidisova, who retired in 2010 but is now making a return to the WTA which began last autumn.
Halep was broken while serving for a three-set win 5-0, but broke back two games later to secure victory in 92 minutes with 17 winners and 27 unforced errors.
Swede Johanna Larsson surprised Czech number 10 Lucie Safarova with a 7-6 (7/5), 6-2 upset victory, while teenaged American Catherine Bellis took revenge for a US Open loss by beating Zarina Diyas 6-2, 6-1.
Bellis, 15, ranks 211 and says she will not decide on turning pro until she cracks the top 100.
Italian Camila Georgi defeated Belgium's Alison Van Uytvanck 6-3, 6-2 while Russian Svetlana Kuznetsova overcame Alison Riske 6-2, 6-2 and Spain's Garbine Muguruza beat Sesil Karatantcheva 6-1, 6-3.
Results on Friday from the fourth day of the ATP and WTA Miami Open (x denotes seeded player):
Women
Second round
Catherine Bellis (USA) bt Zarina Diyas (KAZ x29) 6-2, 6-1
Svetlana Kuznetsova (RUS x24) bt Alison Riske (USA) 6-2, 6-2
Simona Halep (ROM x3) bt Nicole Vaidisova (CZE) 6-4, 2-6, 6-1
Camila Giorgi (ITA x30) bt Alison Van Uytvanck (BEL) 6-3, 6-2
Johanna Larsson (SWE) bt Lucie Safarova (CZE x10) 7-6 (7/5), 6-2
Garbine Muguruza (ESP) bt Sesil Karatantcheva (BUL) 6-1, 6-3
Victoria Azarenka (BLR) bt Jelena Jankovic (SRB x20) 6-1, 6-1
Men
Second round
Tomas Berdych (CZE x8) bt Chung Hyeon (KOR) 6-3, 6-4
Kevin Anderson (RSA x15) bt Sam Querrey (USA) 6-7 (5/7), 7-6 (7/3), 6-4
Bernard Tomic (AUS) bt Austin Krajicek (USA) 7-6 (8/6), 7-5
Andy Murray (GBR x3) bt Donald Young (USA) 6-4, 6-2
Guillermo Garcia-Lopez (ESP) bt Jan-Lennard Struff (GER) 6-4, 6-4
Leonardo Mayer (ARG x24) bt Jarkko Nieminen (FIN) 6-4, 7-6 (7/5)
Santiago Giraldo (COL x27) bt Robin Haase (NED) 6-2, 3-6, 6-0
