Jessicah Schipper will have her own 200 metres butterfly world record in her sights at the national swimming titles in Brisbane on Thursday night.

The Queenslander hinted that she was hungry for another entry in the record books after missing out on improving on her 100m Commonwealth mark at the eight-day nationals on Monday night.

Schipper cruised through to be the fastest qualifier for Wednesday night's final in 2min:07.74sec ahead of AIS-based rivals Felicity Galvez (2:08.82) and Alicia Coutts (2:11.46).

Schipper, 20, may own the 200m world record (2:05.40) but the down to earth Brisbane girl won't have it all her own way in the four lap final.

Galvez - the 2003 200m national champion - made her intentions clear by getting the early jump on Schipper and clocking the fastest heat time on Wednesday before normal service resumed in the semi-finals.

Galvez notched a top five finish at the Athens Olympics and was relegated to silver by Schipper in the Commonwealth Games 200m final in Melbourne.

In other finals on Thursday night, WA young gun Eamon Sullivan will be the one to beat in the 100m freestyle final after being the fastest qualifier (49.11sec) ahead of veteran Ashley Callus (49.49), 200m national champ Kenrick Monk (50.01) and Michael Klim (50.09).

Fourteen-year-old Brisbane schoolgirl Emily Seebohm is in line for a 50m-100m backstroke double.

Seebohm is already the youngest member of Australia's 2007 team for the Melbourne world championships in March after deadheating with Tay Zimmer in the 100 backstroke final on Tuesday night.

Seebohm now has the 50m title in her sights after being the third fastest qualifier in 29.58 behind Zimmer (28.87) and Commonwealth champion Sophie Edington (29.43).

Queensland's Leith Brodie is fastest qualifier for Thursday's 200m individual medley final.

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