McLaren's Jenson Button says he sympathises with the misfortune that former team-mate Lewis Hamilton has had to endure in the 2014 season.
Button, who raced alongside Hamilton between 2010 and 2012, finished sixth in a Belgian Grand Prix in which Hamilton retired after being hit early on by Nico Rosberg.
Hamilton has won five races in 2014 but has also suffered from mechanical problems, having to retire in Australia and Canada, before starting at the back of the grid in Germany and Hungary due to other issues.
"I feel for Lewis, he was leading the race" said Button. "It is unbelievable. I've never seen such bad luck, or misjudgement on other people's part, for Lewis to lose so many points over a period of races.
"It's astonishing, really. I've never seen that before, especially when you have a car that is so dominant and they should be first and second every race. It is just a matter of fighting it out and beating your team-mate, although I know that takes its toll.
"But for me Lewis has come across really well in the media after some disappointing races. He has definitely grown as an individual, which is good to see, and has taken it on the chin. Hopefully it will build his confidence for the rest of the season rather than shatter it."
Button also expressed his disappointment that the fight for the title between Rosberg and Hamilton is not a cleaner affair.
"It is a shame it is not a cleaner fight," Button added.
"I've always said the person who wins the world championship this year is the person who does the best job on the circuit, but that does not quite seem the way it is at the moment."