TURIN :Julian Cash and Lloyd Glasspool became the first all-British duo to claim the year-end doubles number one ranking after winning their second round-robin match at the ATP Finals on Tuesday.

The top seeds lost their opening match on Sunday but hit back to beat German pair Kevin Krawietz and Tim Puetz 7-6(9) 6-2 in Turin's Inalpi Arena to stay on course for the semi-finals.

Whatever happens for the rest of the week, it has been a sensational first full year together for the former U.S. college players who have claimed seven Tour-level titles, including winning Wimbledon and the Masters 1000 in Canada.

"It's been one crazy year, that's for sure," Cash said after lifting the Year-End ATP Doubles No. 1 trophy on court.

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