However, Hamilton said that the news came as little surprise to him, given he has worked with Rosberg throughout his career and knows the German well.
“The sport will miss him but I wish him all the best,” Hamilton said at the press conference in Vienna, as quoted by F1i.
“I’m sure it was a surprise to many people. I’m probably one of the many people that it was not a surprise for but that’s because I’ve known him for a long, long time. But this is motor racing.
“This is the first time he’s won in 18 years, hence why it was not a surprise that he decided to stop. But also he’s got a family to focus on and probably wants to have more children. Formula 1 takes so much of your time.”
Rosberg’s decision brings an end to his fierce rivalry with Hamilton during their four years together as Mercedes teammates.
The two enjoyed a number of clashes both on- and off-track, but Hamilton said that he would miss not having Rosberg to go up against.
“We started karting when we were 13 and we would always talk about being champions,” Hamilton said.
“When I joined this team Nico was there which was something we spoke about when we were kids.
“It’s going to be very, very strange and for sure it will be sad to not have him in the team next year.”
Adam Cianciarulo (450) and Dylan Ferrandis (250) swept both motos of their divisions Saturday in the Lucas Oil Pro Motocross Championship event at Spring Creek MX Park in Millville, Minnesota, significantly impacting the points standings.
“Man, what a dream come true,” Cianciarulo said. “I really wanted to go 1-1 last round at RedBud and had that silly mistake. Today, we got the job done and made it happen. Two consecutive victories in the 450 Class just feels really good. I just want to keep the ball rolling.”
With three rounds remaining, Cianciarulo is ranked second in the standings at a 15-point deficit to Zach Osborne, who won three of the first five rounds.
In the 250 standings, Dylan Ferrandis jumped ahead of Jeremy Martin (who won three consecutive events earlier in the season) by three points (257-254).
Ferrandis beat third-ranked RJ Hampshire in the first moto and nipping Martin by 0.4 seconds in the second.
“That was a difficult race in the second moto and the pressure was on,” Ferrandis said. “It was really good for me to have that battle and come out on top in the second moto. The championship is really close and I think that we were able to put on a good show for everyone today. Jeremy [Martin] and I have a good relationship I think and we congratulated each other and talked about the battle after the race.”
NEXT: The Lucas Oil Pro Motocross Championship will hold its seventh round Sept. 26 with the Geico Motorcycle WW Ranch National at Jacksonville, Florida.
Thor Spring Creek National (Spring Creek MX Park, Millville, Minnesota)
450 Class Overall Results (Moto Finish)
Adam Cianciarulo, Port Orange, Fla., Kawasaki (1-1)
Blake Baggett, Grand Terrace, Calif., KTM (2-2)
Justin Barcia, Monroe, N.Y., Yamaha (5-4)
Chase Sexton, La Moille, Ill., Honda (8-3)
Eli Tomac, Cortez, Colo., Kawasaki (6-5)
Marvin Musquin, France, KTM (3-10)
Christian Craig, El Cajon, Calif., Honda (7-6)
Joey Savatgy, , Suzuki (9-7)
Max Anstie, United Kingdom, Suzuki (10-8)
Zach Osborne, Abingdon, Va., Husqvarna (4-16)
450 Class Championship Standings
Zach Osborne, Abingdon, Va., Husqvarna – 235
Adam Cianciarulo, Port Orange, Fla., Kawasaki – 220
Marvin Musquin, France, KTM – 215
Eli Tomac, Cortez, Colo., Kawasaki – 196
Justin Barcia, Monroe, N.Y., Yamaha – 194
Blake Baggett, Grand Terrace, Calif., KTM – 190
Chase Sexton, La Moille, Ill., Honda – 173
Christian Craig, El Cajon, Calif., Honda – 141
Broc Tickle, Holly, Mich., Yamaha – 134
Joey Savatgy, Tallahassee, Fla., Suzuki – 122
250 Class Overall Results (Moto Finish)
Dylan Ferrandis, France, Yamaha (1-1)
Jeremy Martin, Millville, Minn., Honda (5-2)
Alex Martin, Millville, Minn., Suzuki (4-4)
Jett Lawrence, Australia, Honda (3-6)
Justin Cooper, Cold Spring Harbor, N.Y., Yamaha (9-3)