By Tom Blow Cristiano Ronaldo has slammed Ligue 1 – claiming the “improving” Saudi Pro League is already better because it’s more competitive. Ronaldo’s criticism of France’s top division is a blow to Kylian Mbappe, who is the league’s biggest star. Mbappe, 25, has scored 19 Ligue 1 goals this season – 10 more than anyone else. His form has fired Paris Saint-Germain eight points clear at the top of the table. Mbappe rejected a move to Saudi Arabia last summer but could decide to quit PSG in six months’ time when his contract expires. Real Madrid are leading the race for the Frenchman’s signatu…