Leo Borg and his father, Björn Borg, watch a Stockholm Open match. Photograph: Casper Hedberg/The New York Times

When he was 10, Leo Borg sat his mother down and told her something that made her cry: He wanted to be a tennis player. Until then, Patricia Borg had(...)

South Korea’s Hyeon Chung  celebrates after winning his quarter-final match against American Tennys Sandgren. Photograph: Tracey Nearmy/EPA

It might be as well for the general contentment of the Australian Open that Tennys Sandgren did not complete his fairytale run to the semi-finals, whe(...)