#4 Alan Jones

He was the only the second Australian to win the world championship in 1980 and was the first driver to do so in a Williams car. In his almost 11-year career, he managed to grab 12 Grand Prix victories and 24 podium finishes.
Jones probably came closest to winning the Monaco Grand Prix amongst others in this list. He failed to win at Monaco in his Championship winning year but, came closest in 1981.
After Nelson Piquet had spun out of the race, Jones took a huge lead in the race. But, due to the engine in his Williams car, he had to make multiple pit stops. Gilles Villeneuve took the lead away from Jones and grabbed a famous victory.
#3 Jaques Villeneuve

Although he was more successful than his father Gilles Villeneuve in the sport, he failed to match the success of Gilles at Monaco. Jaque won his first and only World Championship in the year 1997 with Williams.
In 1996, the Canadian crashed into a backmarker in the latter half of the race and in 1997, he crashed into the walls, very early on in the race. These were his best chances to win at Monaco, as his competitive career, pretty much ended in 1997. He did finish 4th in 2001 while racing for BAR.