Federer has feasted on Australian opponents in grand slams over the years, piling up an 18-1 record against men from Down Under, and Groth, who was facing a top 10 opponent for the first time, proved little more than a distraction to the Swiss maestro.
The burly Groth, who had a brief stint as an Australian Rules football player in 2011, stepped onto Arthur Ashe Stadium court looking ready for a fight but in the end could only wave the white flag as Federer closed out the match with an ace, sweeping through the final four games.
Throughout the one hour and 48 minutes contest the Australian took his best shots at the 33-year-old, including booming serves of over 140mph.
"I didn't know if it went into the stands or the bottom of the net or on the other side. I just felt like I hit it clean. The 147 one I felt like I was there and felt like I had more control on it.
"The difference between 142 and 147, there's none really in the racquet. I think once you pass the 135 range everything is just really fast."
Tomic said his left hip began bothering him after his first round match against Germany's Dustin Brown.
"I did the best thing not to play," Tomic told reporters. "I don't want to muck around with that area. For sure something is there. I've got to get it checked. Got to get it analyzed the next few days ... It's painful."
Bulgarian seventh seed Grigor Dimitrov breezed into the third round with the loss of just five games against Israel's Dudi Sela after a 6-1 6-2 6-2 demolition, while Belgian David Goffin lost just one game more in advancing past Joao Sousa of Portugal 6-4 6-2 6-0. Dimitrov will next meet Goffin.
Sixth seed Tomas Berdych had a much tougher time, needing five sets and three hours 45 minutes to tame Martin Klizan of Slovakia 6-3 4-6 6-2 3-6 6-3.
Working harder was 18th-seeded South African Kevin Anderson, a four-set winner against Jerzy Janowicz of Poland, while Spain's 19th seed Feliciano Lopez won a fourth-set tiebreaker to advance past Japanese qualifier Tatsuma Ito.
Results from the US Open Men's Singles Round 2 matches on Friday
2-Roger Federer (Switzerland) beat Sam Groth (Australia) 6-4 6-4 6-4
6-Tomas Berdych (Czech Republic) beat Martin Klizan (Slovakia) 6-3 4-6 6-2 3-6 6-3
17-Roberto Bautista (Spain) beat Tim Smyczek (US) 6-3 6-2 6-1
26-Gilles Simon (France) beat Federico Delbonis (Argentina) 6-4 3-6 7-5(0) 6-1
12-Richard Gasquet (France) beat Paolo Lorenzi (Italy) 7-6(4) 6-3 6-3
David Goffin (Belgium) beat 32-Joao Sousa (Portugal) 6-4 6-2 6-0
4-David Ferrer (Spain) beat Bernard Tomic (Australia) walkover
7-Grigor Dimitrov (Bulgaria) beat Dudi Sela (Israel) 6-1 6-2 6-2
19-Feliciano Lopez (Spain) beat Tatsuma Ito (Japan) 6-4 3-6 6-4 7-6(4)
14-Marin Cilic (Croatia) beat Illya Marchenko (Ukraine) 7-6(2) 6-2 6-4
18-Kevin Anderson (South Africa) beat Jerzy Janowicz (Poland) 6-7(6) 6-2 6-1 6-3
20-Gael Monfils (France) beat Alejandro Gonzalez (Colombia) 7-5 6-3 6-2
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- Bernard Tomic