The New Zealand combination of Marcus Daniell and Artem Sitak have eliminated the top seeds in the doubles at the ASB Tennis Classic.
They've beaten Colombians Juan Sebastian Cabal and Robert Farah in straight sets.
Daniell and Sitak easily won the 6-2 but had to win the deciding set in a tiebreak, 7-6.
There were two major upsets in the singles draw too with seventh seeded Croatian Ivo Karlovic eliminated by Canada's Vasek Pospisil, and the Australian qualifier Matthew Barton eliminating American Steve Johnson.
On Tuesday the veteran German Philipp Kohlschreiber will begin his eleventh New Zealand Open tournament.
Kohlschreiber, who's currently ranked 34th in the world won the tournament in 2008 and finished runner-up in 2013 but he's not seeded for this year's tournament.
He plays Germany's Benjamin Becker in the first round.
World number 18th and fifth seed Benoit Paire is the top seed in singles action today he plays New Zealand's Michael Venus in the evening session.