Serena Williams can become the first woman since 1988 to win all four Grand Slam titles in the same year, her coach Patrick Mouratoglou believes.
He says it would be an "exceptional" achievement, but told BBC Sport: "With Serena, everything is possible."
Speaking on the eve of the draw for the first Grand Slam of the season in Melbourne, he added: "Look at the level she plays at at the moment.
"She's beaten all the top players many times, so you can aim that high."
