LONDON, July 6 : Mercedes have shouldered the blame for Formula One leader Kimi Antonelli's failure to score points in Sunday's British Grand Prix, the Italian's second such blank in the last three races.Antonelli started on pole position at Silverstone and after losing two places straightaway to Ferrari had fought back to have a possible victory in his sights when his car suffered a mechanical failure with 11 laps to go.Mercedes team boss Toto Wolff said the team's strategists had predicted Antonelli, 19, would have caught Ferrari's eventual winner Charles Leclerc six laps from the end without the problem, caused by a broken front wheel shield around the brake duct.The team pitted the teenager twice to try and resolve the issue and then told him to retire, a command Antonelli resisted as