Lleyton Hewitt has shoved sentiment aside to storm into the US Open final with a trademark 6-4 7-5 6-3 victory over family friend Joachim Johansson.

Hewitt dismantled the longtime partner of his younger sister Jaslyn with the same clinical precision as shown in his five previous straight-set wins at Flushing Meadows over the past fortnight.

Australia's 2001 champion will meet the winner of the second semi-final between world No.1 Roger Federer and British fifth seed Tim Henman on Sunday.

Hewitt will enter his third grand slam final, and first since his Wimbledon triumph two years ago, oozing confidence after extending his winning run to 16 matches with another highly impressive performance.

The South Australian faced just one break point on his serve during the entire match, while continually applying the pressure on the towering Swede's.

Johansson had hammered down 109 aces en route to his first grand slam semi-final, but found Hewitt - roundly considered the game's best service returner - a far more difficult proposition.

After surviving his sole break point of the match in the fifth game, Hewitt seized on three forehand errors from Johansson to gain triple set point with the 28th-seeded Johansson serving at 4-5 and 0-40.

Hewitt netted a backhand on his first chance, but capitalised on the next point when the Swedish quarter-final conqueror of defending champion Andy Roddick swung wildly at an overhead and watched the ball sail long and wide.

There were no further break points on either players' serve until the 12th game of the second set and again it was Hewitt who pounced, grabbing a commanding two-sets-to-love lead when Johansson again erred going for a big forehand winner.

With victory now firmly in his sights, Hewitt produced an almighty roar in celebration, leaving his sister expressionless as she watched on in a neutral box in New York's Arthur Ashe Stadium.

Brought to you by AAP © 2024 AAP