Djokovic trying to stay optimistic

Novak Djokovic was keen to look at the positives despite suffering a surprise quarter-final exit to Ivo Karlovic at the Qatar ExxonMobil Open.

World number one and top seed Djokovic would have been expected to see off the challenge of Karlovic and seal his place in the last four, and he looked on course to do that after edging the first set.