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The Latest on motorsport's busiest day, with Formula One's Monaco Grand Prix followed by the Indianapolis 500 and NASCAR's Coca-Cola 600 (all times local):
10:15 a.m. ET
The conclusion of the Monaco Grand Prix means the attention of the motorsports world shifts to Indianapolis, where the 100th running of the Indy 500 is expected to draw close to 400,000 fans.
Assuming they can all get to Indianapolis Motor Speedway.
There was gridlock everywhere around the speedway five hours before the race was set to begin. Getting through famed Gasoline Alley as cars were pulled to the starting grid was like wading through a cattle pen. Things weren't much better on pit road, where teams were going through last-minute prep.
James Hinchcliffe is on the pole for the centennial race.
Defending Formula One champion Lewis Hamilton has won the Monaco Grand Prix, holding off Daniel Ricciardo for his first win of the season.
Hamilton had not won for the past eight races, but he pulled ahead after Ricciardo came in on lap 33 for ultra-soft tires only to have his Red Bull pit crew not ready. It cost him valuable time and he came out behind Hamilton.
Ricciardo was close to overtaking Hamilton on lap 37. But Hamilton held his line at the Mirabeau turn, prompting an angry reaction from Ricciardo, who waved his hand furiously as he was forced to back off.
Mexican driver Sergio Perez of Force India was third ahead of Sebastian Vettel's Ferrari.
The wrecks continue at the Monaco Grand Prix, this time with Sauber teammates Felipe Nasr and Marcus Ericsson getting into each other.
Nasr received team orders to let Ericsson through but apparently ignored them. A determined Ericsson went for a gap that simply did not exist and they both collided at the Rascasse turn.
Ericcson quipped that his teammate's radio "musn't be working."
In all, seven drivers were knocked out of the race.
Red Bull's Max Verstappen — who became the youngest winner of an F1 race at the Spanish GP two weeks ago — has crashed out of the Formula One race in Monaco.
On a day with slippery conditions on the track, the 18-year-old slammed into a barrier at the same point where he crashed in Saturday's third and final practice.
He is the fourth driver to crash out on a chaotic day: Russian driver Daniil Kvyat got into the turn at La Rascasse, taking Kevin Magnussen into the barriers with him.
Kvyat, who has twice been blamed for racing incidents with Ferrari driver Sebastian Vettel this season, went out of the race, while Magnussen carried on a lap behind.
Ferrari driver Kimi Raikkonen and British driver Jolyon Palmer — Magnussen's teammate at Renault — both crashed earlier.
After seven laps behind a safety car, British driver Jolyon Palmer crashed out and was soon joined back in the garage by Ferrari driver Kimi Raikkonen.
Raikkonen lost control of his car after breaking too late going into a hairpin, locked his wheels and slammed into the barrier.
He tried to continue but almost caused another collision, with French driver having to brake sharply to avoid smashing into the back of him.
"What's Kimi doing?" screeched Grosjean.
The Monaco Grand Prix traditionally sees an influx of movie stars from nearby Cannes, where the famous film festival is held.
This year, the events are a week apart and there's a notable absence of big names so far.
However, actor Patrick Dempsey — a long-time star of "Grey's Anatomy" and a huge motorsport fan — is in the paddock.
The 50-year-old American has been chatting with Red Bull driver Max Verstappen and Frenchman Romain Grosjean — who drives for the American-based Haas team — before the race.
There is more of a sporting flavor than a Hollywood theme, with basketball stars Chris Bosh (Miami Heat) and Tony Parker (San Antonio Spurs) and International Olympic Committee president Thomas Bach all present.
Bosh, pictured on his twitter feed wearing a Mercedes cap, has expressed his support for Lewis Hamilton.
Arsenal soccer star Theo Walcott and Danish tennis player Caroline Wozniacki are also here.