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Dragons halfback Adam Clune.

St George Illawarra's Adam Clune isn't the NRL's biggest name but one thing that can't be questioned is his on-field work ethic.

In four matches this season - deputising for the suspended Corey Norman in round one and then for the injured Ben Hunt over the past three games - Clune has racked up the most kilometres of any player twice and finished second on another occasion, per Telstra Tracker data.

Clune is one of three players to tally 10km or more in a game this year having posted 10.08km in round four against the Knights. Parramatta's Clint Gutherson (10.29km, round three) and Rooster Sam Walker (10.07km, round four) are the others to reach the mark.

The Dragons playmaker ran 9.44km in round one (second in the league) and topped the total distance leaderboard last weekend despite his team losing 20-14 to the Warriors at Netstrata Jubilee Oval.

Other standout efforts in round six included Manly's Jason Saab again recording the fastest speed with 36.2km/h in a win over Titans - a week after scorching the turf to reach 38km/h against the Warriors.

South Sydney winger Alex Johnston (35.9km/h) showed plenty of toe in his team's golden point victory against the Wests Tigers.

In the other categories, Sea Eagles flyer Reuben Garrick recorded the most high-speed metres (20km/h or more) with 962m ahead of ever-improving Sharks fullback William Kennedy (846m).

And Melbourne utility Nicho Hynes ranked first for relative distance (metres per minute) with 108 - but he only played 24 minutes off the interchange in the Storm's triumph over the Sydney Roosters.

Panthers halfback Nathan Cleary, meanwhile, played the full 80 minutes against the Broncos and posted 106mpm in addition to scoring the decisive try and booting a clutch two-point field goal.