Top five highlights of the 2015 F1 season

You cannot escape the fact that 2015 was not the most exciting Formula One season of recent memory. Unlike 2014, we didn't even have a last-round battle for the title between teammates to enjoy, since Lewis Hamilton ran away with the championship early. But, was it really that bad of a year? Of course, there were some less-than-enthralling races, but there were also some memorable Sundays that reminded us of how good this sport can be. Here are five that are worth recalling:

Monaco GP: Hamilton's pit stop of despair

The Monaco Grand Prix was enlivened when Mercedes made a pit call that turned the race on its head. A communication mix-up between leader Lewis Hamilton and his engineer saw the World Champion pit for tires under a late safety car, when his main rivals stayed out. It resulted in the man who had dominated the day tumbling down to third behind teammate Nico Rosberg and Sebastian Vettel. The race concluded with a dramatic eight-lap sprint to the line, during which Lewis was unable to make any progress. Rosberg won his third straight Monaco GP -- an impressive achievement -- although even the winner admitted that fortune had smiled on him, and this was Hamilton's race. It was not to be the last time in 2015 that some controversy surrounded radio traffic between Lewis and his team.

Hungarian GP: Vettel wins as F1 mourns Bianchi

Having already won in Malaysia, Vettel scored a memorable victory in the Hungarian GP on a day when the stars appeared to align. A sport that had faced criticism for a lack of entertainment provided a memorable afternoon on a weekend when everyone was remembering Jules Bianchi. The drivers joined with the Frenchman's family on the grid to honor him with a minute's silence, then donned their helmets and went out and put on a superb display that showcased F1 at its best. The race had collisions, penalties and even some genuine overtaking moves. In the end, the usually dominant Mercedes team could manage only sixth and eighth places. A win for Ferrari -- the team that had mentored Bianchi for so many years -- was the best possible outcome. Vettel was quick to dedicate the victory to the driver who would likely one day have been his teammate.

Singapore GP: Mercedes all tired out...

Against expectations, Mercedes struggled to find pace on the Marina Bay circuit -- the only time it happened all season. Remarkably, Hamilton and Rosberg lined up only fifth and sixth, while Vettel took pole for Ferrari ahead of Daniel Ricciardo, Kimi Raikkonen and Dany Kvyat. The stage was set for a fascinating race -- could Mercedes find speed on Sunday night? In the end, it didn't happen, and Vettel headed Ricciardo home after an exciting race. Rosberg finished fourth and Hamilton had a rare retirement, ironically on a day when he was struggling anyway. Mercedes has yet to come up with a full explanation for its lack of form that weekend, but the curious thing is after the team made some set up changes, Rosberg found performance in subsequent races.

United States GP

Hamilton joined the elite group of F1 drivers who have won three or more World Championships, as he secured the 2015 title with a superb victory over Rosberg in Austin. Matching Ayrton Senna's three titles was a huge ambition achieved for Hamilton. Against the odds after three days of rain delays and little track time, fans were treated to a fabulously entertaining race that began on a wet track that ultimately dried, which allowed the drivers to race to the flag on slick tires. For much of the race, the Mercedes guys were in a fight not just with each other, but with Ricciardo and Kvyat, and later Vettel. Hamilton's title was not confirmed until the final lap, for if Vettel had managed to pass Rosberg and claimed second, the battle would have gone to the next race in Mexico.

Mexican GP: A country embraces F1

The World Championship was over by the time the Mexican GP rolled around, but nevertheless much anticipation surrounded the return to a venue last used by F1 in 1986. The track had been rebuilt for the F1 race, as had the pit and paddock area, while the big talking point was the unique section through the former baseball stadium -- providing a great view for the fans. The fans were the story of the weekend, as they showed unbridled support for F1, and local hero Sergio Perez in particular. Come Sunday, Rosberg bounced back from recent disappointments to score the first of three season-ending victories as he staked his claim for 2016. It was not a great race, but truly a great event.