The two players were named as the top seeds for the men's and women's singles event at the Australian Open which starts on Monday.
Wimbledon champion Roger Federer took just 46 minutes to beat Tomas Behrend 6-1, 6-1 in the first round of the Swiss Open on Tuesday.
The Swiss holds the rare distinction of not attracting any negative press despite being a top sportsman.
The world number one believes he is pulling away from his rivals in men's tennis.
He said that experience had taught him how to handle "an incredibly good baseliner" like Nalbandian.
World number one and defending champion Roger Federer won an epic 20-18 tie-break to seal a 6-3, 7-6 win over Marat Safin and place in the Masters Cup final.
Andy Roddick, Juan Carlos Ferrero and Roger Federer are in the running for the title at next week's Masters Cup.\n\n
American Andy Roddick and Briton Greg Rusedski will be going head-to-head on Centre Court in the race to hit the world's first 150 miles per hour (241.4 kph) serve.
The 32-year-old continued the form that has brought him 22 victories in 23 matches this year, to reach the final of the U.S. Clay Court Championships on Saturday.
Russian Nikolay Davydenko saw off Tommy Haas in the U.S. Open quarter-finals for the second successive year, beating the German 6-3 6-3 6-4 on Wednesday to reach the last four without dropping a set.
Taylor Dent and Robby Ginepri will contest the first all-American final in Indianapolis since Pete Sampras beat Jim Courier 13 years ago.\n
Roger Federer will end the year as world number one for the third time in a row.
Spanish teenager Rafael Nadal upset Russian 15th seed Mikhail Youzhny in a dramatic second-round battle.
Eyeing a sixth Grand Slam title, the Spaniard was eventually too strong for the metronomically consistent Fritz, whose biggest weapons were still not damaging enough to unsettle the second seed under a fiery sun on Centre Court.
'I'm not going into this thinking I'm the favourite because everything's totally different when you're playing a match like this.'
Frances Tiafoe, Taylor Fritz, Tommy Paul and Coco Gauff all advanced to the third round of the US Open on Wednesday to keep home hopes alive.
The following are five contenders for the men's title at Wimbledon, which begins on Monday.
Novak Djokovic's battling victory under the lights of Arthur Ashe Stadium made him the oldest man to reach the last 16 at the US Open.
Andy Roddick's hopes of a fifth Queen's Club title ended painfully on Saturday when the American limped out midway through the first set of his all-American semi-final against James Blake with a right ankle injury.
Frances Tiafoe is the first American man to make a US Open semi-final since Andy Roddick in 2006.
Defending champion Jannik Sinner dismissed eighth seed Alex de Minaur 6-3, 6-2, 6-1 to reach the Australian Open semi-finals and extend the country's decades-long wait for another homegrown singles winner at the Grand Slam on Wednesday.
Mardy Fish replaced Andy Roddick as the top-ranked American after beating Spain's David Ferrer 7-5, 6-2 on Wednesday to move into the semi-finals of the Sony Ericsson Open.
Second seed Roger Federer beat Andy Roddick 5-7 7-6 7-6 3-6 16-14 in an epic Wimbledon final to claim a record 15th Grand Slam title.
Talk about a man in a hurry -- 10th seed Ben Shelton required just 55 seconds to finish off Australian Rinky Hijikata and reach the Wimbledon third round on Friday.
Serena Williams returned to the top of the world with a routine win at the China Open on Tuesday but Andy Roddick and Jelena Jankovic plumbed the depths when their title defences ended in their opening matches.
World number two Roger Federer survived a gritty Andy Roddick fightback to beat the American 7-5, 6-7, 6-1 on Friday to advance to the semi-finals of the Madrid Open. Third seed Novak Djokovic also stayed on course for a fifth straight final appearance with a 6-4, 6-4 win over Croatian wildcard Ivan Ljubicic.
The Swiss top seed begins his quest for a record-equalling fifth consecutive men's singles title against Teimuraz Gabashvili, while second seed Rafael Nadal meets American Mardy Fish.
Andy Roddick's rare victory over world number one Roger Federer last week has boosted his confidence in time for this weekend's Davis Cup quarter-finals where he will pilot holders the United States against France. Eight of the world's top 10 players will line up for the four ties being played from Friday to Sunday.
It took the 20-year-old American a minute short of five hours to make his 11-year advantage count against the valiant Moroccan, Roddick sealing a five set victory to reach his first Grand Slam semis.
Rafael Nadal battled past German Tommy Haas 7-6, 6-3 to reach the Cincinnati Masters quarter-finals.
Novak Djokovic outgunned Andy Roddick in a high-quality shootout to set up a tantalising semi-final with four-times champion Roger Federer.
The sorry state of American men's tennis will continue for some time with no real talent on the horizon, said Pete Sampras who dominated the game in the 1990s with fellow American Andre Agassi.
The rain that plagued the Wimbledon fortnight came to the rescue of Roger Federer in the men's final on Sunday.\n\n
Best buddies Sam Querrey and Mardy Fish will have to put friendship aside for an hour or so after reaching the Queen's Club grasscourt final.
