Nov 19 (Reuters) - Mercedes Formula One team boss Toto Wolff declared the gloves were off as he and Red Bull rival Christian Horner engaged in more verbal sparring at the inaugural Qatar Grand Prix on Friday. The two principals have been needling each other all season amid the ebbs and flows of the title battle and they appeared together in a scheduled news conference between practice sessions at Losail. The fighting talk came to the fore again, following on from last weekend"s race in Brazil that was overshadowed by suspicions and accusations. Asked whether there was still mutual respect ahead of the final three races, Wolff replied: "There are many great people working in Red Bull and obviously many in Mercedes and it"s a hell of a fight. "There is a respect for the capability that Red Bull has, definitely, and it"s clear that this is tough. It"s the world championship of the highest category in motor racing and what started as Olympic boxing went to pro boxing and is now MMA. "Gloves are off and nothing else is to be expected." Horner, asked for his view, replied bluntly: "There is no relationship." Defining it as "the most intense political title fight" the team had ever experienced, he said relationship and respect were different things and he respected the achievements of Mercedes and seven-times world champion Lewis Hamilton. "But I don"t need to go to dinner with Toto, I don"t need to kiss his arse or anything like that. There"s a few other team principals who might..." Horner, who recently compared Wolff to a "pantomime dame" after being labelled a "windbag" before that by the Austrian, said they were just very different characters. "Am I going to be spending Christmas with Toto? Probably not, unless you"re in panto this year? I might take the kids," added the Briton. "You don"t have to be best mates with your opponents. How can you be? I think that would be dishonest to fake a facade when you"re competing against each other." Mercedes are 11 points clear of Red Bull in the constructors" championship but Red Bull"s Max Verstappen is 14 ahead of Hamilton.