By Ian Westbrook
BBC Sport at Wimbledon
Martina Navratilova rolled back the years as she swept aside Catalina Castano 6-0 6-1 in just 46 minutes.
Navratilova, 47, making her first return to singles since 1994, knew too much for the Colombian opponent as she raced 5-0 ahead on a packed Court Two.
Even a rain break could not dent her concentration as she stayed in control.
Castano finally held her serve to win the 12th game, her first of the match, and had a break point in the next, but could not stop the nine-time champion.
Castano is ranked 102nd in the world but had played just four matches on grass in her career.
In contrast, her wildcard opponent, 23 years her senior, made her debut at the All England Club in 1973.
Navratilova secured victory in 46 minutes and will now play Argentine Gisela Dulko, who beat her in the first round
of the French Open.
Navratilova, whose world singles ranking is 700, admitted it had been a uneven contest.
didn't do anything spectacular. I have an advantage because
I know how to play on grass," she said.
"You can only play as well as your opponent - she didn't push me until the end."
Navratilova will face Gisela Dulko in the second round.
The 19-year-old Argentine was making her debut in SW19 against the 2000 semi-finalist and 23rd seed Jelena Dokic but did not look fazed.
A break in the third game helped her win the first set and she was always in control after that.
Dokic briefly looked like she could recover when she produced two aces in a row when 5-1 down in the second, but Dulko clinched it 6-3 6-3.