Champion Winx has opened at $1.10 to extend her winning streak to 18 when she returns in the Group Two Warwick Stakes at Randwick.

Her nearest market rival is Missile Stakes winner Invincible Gem at $13 with the TAB but the Kris Lees-trained mare is not certain to run on Saturday.

There were 10 horses nominated on Monday to take on Winx in the 1400m-race with several also entered for other races on the program.

Apart from Winx, trainer Chris Waller has entered Antonio Giuseppe, Foxplay and Who Shot Thebarman.

Entries have been extended until Tuesday morning.

Credit: AAP