Neck-and-neck supermaxi battle for Sydney to Hobart

Master Lock Comanche had a slim lead over LawConnect in the battle for Sydney-Hobart line honours. (HANDOUT/ROLEX SYDNEY HOBART YACHT RACE)

Sydney to Hobart leader Master Lock Comanche is keeping a "close eye" on major rival LawConnect as the two supermaxi yachts fight out a tight tussle for line honours.

Comanche held a narrow advantage of four nautical miles over LawConnect, which is aiming for a third straight first-past-the-post win, in Bass Strait at 5.30pm on Saturday.