Australian Alex de Minaur is through to his second straight Sydney International decider after beating Gilles Simon 6-3 6-2 in their semi-final on Saturday.

After the match was postponed from the previous night due to rain, de Minaur has just five hours to rest up and recover before his final against Andreas Seppi.

The 19-year-old Australian assumed control of the match in hot conditions when he broke Simon in his first service game, before wrapping up the match in 94 minutes.

AAP