Sharapova is ranked 30th in the WTA ranking and Voznacka is in third place. Both were once at the top of the rankings.
Sharapova is the winner of the 2008 Australian Open Championship, but he has generally won five Grand Slam titles during his career.
In the fourth round or eight in a row, Sharapova will meet Australia's first missile and homemaker Ashley Bartique, who finished 15th in the WTA ranking and third in the match with 7-5, 6-1, overtaking Greek Maria Sakari.
Also in the fourth round, Sloein Stevens, the fifth in the rankings, also beat the USA, who with 7-6 (8: 6), 7-6 (7: 5) beat the Croatian Petru Martich, who is in 32nd.
In another match for the first in this century, tennis players who entered the fourth round of the Australian Open Championship have become American player Amanda Anisimov, who is in 87th place in the WTA ranking. Anisimova, aged 17, with a 6-3 6-2 record, outpointed Belarussian Arina Sabaļenk, who is in 11th place.
The fourth round of the men's tournament was reached last year's champion and Roger Federer of Switzerland, who with 6-2, 7-5, 6-2, defeated the American Taylor Fritz, who was ranked 50th in the ranking .
He has won six of his 20 Grand Slam titles in Australia.
In the eighth final, Federer Stephen Cicips, who is in 15th, will face Federer.
It has been reported that tennis player Anastasia Sevastov of Latvia reached the fourth round, and Alona Ostapenko and Ernest Gulbis stopped in the first round.