Nope, not even close. Football (soccer) is.
No way man. Thats just utter garbage.
It is much more difficult to make it in tennis than football.
In football the players in lower leagues in football, can still get paid a fortune.
Tennis players who get stuck in futures and challengers make very little money in tennis.
Also there are far far more players who can make it in football as you need many people to make up a team, whereas in tennis its just one guy.
In the UK how many people could you say made it in tennis in the last 10 years. Henman, Rusedski and Murray makes 3 who got to the top of the game. Then maybe 10 to 20 others got to some decent professional level like Martin Lee, Bogdanovic, Parmar, Sherwood, Hilton, Childs etc
In football there are hundreds of football players who made it and compete in the premier league or 1st division, being paid an obscene amount of money.
In all seriousnes the 10000th best football player in the world can probably make a living from it, and earns more money than the 100th best tennis player in the world.