Melbourne - American Madison Keys declared herself 100 percent fit for a tilt at the Australian Open title after crushing local wildcard Destanee Aiava 6-2, 6-2 to reach the second round on Monday.
The 23-year-old was a consistent performer at Grand Slams last year, reaching the semis at the French and US Open, as well as the quarter-finals in Melbourne.
She is looking to improve on her best performance at the Australian Open, a semi-final appearance against eventual champion Serena Williams in 2015.
Keys said she had skipped warm-up tournaments to ensure she had no fitness problems.
"I was having issues with my knee at the end of the year and was running out of time and wouldn't be ready for Brisbane, so I knew I wanted to be 100 percent ready for here," she said.
"There's obviously things that I want to work on, overall just being a more solid tennis player."
She will next play either France's Pauline Parmentier or Russia's Anastasia Potapova.
Results from Day 2 of the Australian Open on Tuesday:
Ryan Harrison (USA) bt Jiri Vesely (CZE) 6-0, 7-5, 6-3
Daniil Medvedev (RUS x15) bt Lloyd Harris (RSA) 6-1, 6-2, 6-1
Fabio Fognini (ITA x12) bt Jaume Munar (ESP) 7-6 (7/3), 7-6 (9/7), 3-1 retired
Karolina Pliskova (CZE x7) bt Karolina Muchova (CZE) 6-3, 6-2
Wang Qiang (CHN x21) bt Fiona Ferro (FRA) 6-4, 6-3
Madison Keys (USA x17) bt Destanee Aiava (AUS) 6-2, 6-2
Elise Mertens (BEL x12) bt Anna Karolina Schmiedlova (SVK) 6-2, 7-5
Aleksandra Krunic (SRB) bt Zarina Diyas (KAZ) 3-6, 7-5, 6-1
Anastasia Potapova (RUS) bt Pauline Parmentier (FRA) 6-4, 7-6 (7/5)
Serena Williams (USA x16) bt Tatjana Maria (GER) 6-0, 6-2