This would be the modern-day equivalent of Shaquille O'Neal showing up at Pala to have Ryno teach him how to ride dirt bikes!

1979

At the Valvoline 125cc U.S. Grand Prix of Motocross at Mid-Ohio, Team Suzuki's Mark Barnett took the overall win via 2-1 scores, topping defending AMA 125cc National Champion Broc Glover and three-time 125cc FIM Motocross World Champion Gaston Rahier, now with Yamaha. Eight days earlier, Barnett had won his first supercross, the '79 Superbowl of Motocross.

1984

Broome-Tioga in Binghamton, New York, hosted a 125/250/500 National triple-header, where Kawasaki's Jeff Ward topped Johnny O'Mara in the 125 Class, Yamaha's Rick Johnson beat Kawasaki factory rider Billy Liles in the 250 Class, and Yamaha's Broc Glover topped rival David Bailey of Team Honda in the 500 Class.

Check out Thom Veety of Action Photos' shots of the Glover/Bailey duel at Broome-Tioga. Both were wearing #1 because Glover was the defending 500 National Champion, but Bailey was the defending AMA Grand National Champion when the two series (SX and MX) were tied together. He was also the defending AMA 250 National and AMA Supercross Champion. They would later team up

And over in Nismes, Belgium, British Suzuki rider Jeremy Whatley won the 250 Grand Prix as series points leader Heinz Kinigadner failed to finish either moto. Whatley went 2-2 for the overall. The moto winners were French Yamaha pilot Jacky Vimond and German KTM rider Arno Dreschel.  

2001

At Kenworthy's MX Park in Troy, Ohio, Kawasaki's Ricky Carmichael went 1-2 to take the overall win, as Yamaha rider Tim Ferry DNF'd the first moto but came back out to win the second race. Factory Connection Honda's Mike LaRocco finished second overall with 4-3 scores.

The 125 Class was won by Pro Circuit Kawasaki rider Mike Brown with 1-1 moto finishes. Yamaha of Troy's Ernesto Fonseca was second with 2-6 moto finishes and Ohio's own Brock Sellards was third on his KTM.  Series points leader Travis Pastrana struggled to 10-5 finishes after a big crash on the last lap of the Unadilla National the week before left him with a concussion.

2007

James Stewart won the Thunder Valley 250 National with unlikely 4-2 scores. The Kawasaki rider had suffered a concussion in practice the week before at Unadilla and sat out the race, despite it being the first race of 2007 that the soon-to-retire Ricky Carmichael raced. Stewart rode cautiously but the cards fell right in place for his overall chances, as KTM's Mike Alessi went 3-3 for second and Honda's Andrew Short went 2-4. The moto winners were not consistent, as Honda's Davi Millsaps went 1-8 and Kawasaki's Tim Ferry went 11-1.