Nalbandian tumbles out of Toronto Masters
The burly Nalbandian was completely outclassed by the 33-year-old qualifier, who needed just 58 minutes to collect his first win in three attempts on Canadian hard courts.
In other first-round action, fourth seed Ivan Ljubicic of Croatia eased passed Spain's Nicolas Almagro 7-5 6-1 and fifth seed James Blake needed just 56 minutes to crush the hopes of home town favourite 17-year-old Canadian Philip Bester 6-4 6-1.
In contrast, Argentina's Jose Acasuso needed more than two hours and an epic second set tiebreak to beat Germany's Bjorn Phau 7-5 7-6 (20-18).
The tiebreak equaled the longest on the ATP Tour record books. It marks the fifth time a singles tiebreak had gone the record distance first reached by Bjorn Borg and Premjit all at Wimbledon in 1973. Biggest scalp
Sanguinetti had just three career wins over top 10 opponents and the 24-year-old Nalbandian -- currently a career-high number three in the world rankings – represents the biggest scalp claimed by a man who spent last week playing at a Challenger event in Recanati, Italy.
"I was relaxed," the 68th-ranked Sanguinetti told reporters. "If I lose, it's not a shame to lose to number three in the world. I was surprised by the score but I think I made him play my game. "I love it. I love to see the old man can still win against the young guys."
The Argentine attributed his early exit to a fever that he said left him short of energy.
"I had a fever but I wanted to try and play," said the South American. "I said to myself that I would give it a go. "I tried to compete but I didn't have the energy."
Czech Tomas Berdych, seeded 13, advanced with a 6-4 7-5 win over Canada's Daniel Nestor while 15th seed Fernando Gonzalez of Chile scraped by Sweden's Robin Soderline 6-3 4-6 6-2.
Ninth seed and Australian Open finalist Marcos Baghdatis joined Nalbandian at the exit after falling 5-7 6-2 6-3 Julien Benneteau of France.
Britain's Tim Henman received easy passage into the second round breezing past Sweden's Jonas Bjorkman 6-2 6-3.
Henman's former Davis Cup teammate Greg Rusedski, however, lost 6-4 6-2 to Russian Mikhail Youzhny.
In a battle of former French Open champions, Spain's Carlos Moya brushed past Argentina's Gaston Gaudio 6-1 6-4.