Nadal beginning to show signs of Federer challenger

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Who	Why They're Up
	Rafael Nadal Who says Roger Federer lacks a rival? The Spaniard beat the mighty Fed for the third time in four tries, this one in the Dubai final, to win his first title of 2006. Suddenly things are getting interesting in time for Indian Wells and Key Biscayne.
	James Blake At the inaugural Las Vegas event, Blake won his second title of '06, beating old nemesis Lleyton Hewitt in a three-set final.
	Nadia Petrova In Doha, the Russian upset Amelie Mauresmo (who was on the verge of becoming No. 1 in the rankings) to win her second WTA title.
	Anna-Lena Groenefeld The German up-and-comer won her first WTA singles title, beating Flavia Pennetta in Acapulco.
	Luis Horna The Peruvian Prince won his first career trophy at the Abierto Mexicano Telcel after defeating No. 7 seed Juan Ignacio Chela, 7-6 (5), 6-4.
	Lourdes Dominguez Lino A holdover from last week. She won her first title in Bogota.
	USTA We hear a big announcement is forthcoming that instant replay will be used at the U.S. Open.
	Pete Sampras Both for returning to the fray (he's playing World Team Tennis) and investing personal funds to keep Indian Wells in the United States. Welcome back.
	Doubles winners Hanley and Ulyett in Dubai. Bryan and Bryan (pictured) in Vegas. Hantuchova and Sugiyama in Doha. In Acapulco, Groenefeld and Shaughnessy for the women, Cermak and Friedl for the men.
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Who	Why They're Down
	Bjorn Borg The five-time Wimbledon champ is selling his old trophies to achieve "financial security."
	Andre Agassi Never mind his decision to forgo the inaugural Las Vegas event to take the Dubai appearance fee booty. His early-round loss to little-known Bjorn Phau has to be dispiriting.
	ITF Predictably, every news agency picked up the oh-the-irony story about the wheelchair tennis player who got clipped for "doping." Lost in the fine print: The positive test was triggered by a drug in the player's asthma medication; and "the tribunal found no intent to enhance performance." Rules are rules, and if the player needs to serve a suspension, so be it. But -- other than embarrassing the poor guy and turning wheelchair tennis into monologue fodder -- what good is possibly served by the ITF publicizing this result?
	Robby Ginepri The slumping American lost another early match, this one to Paul Goldstein in Vegas.
	Guillermo Coria Another week, another first round loss -- this one in Mexico.

Sports Illustrated senior writer Jon Wertheim covers tennis for the magazine and is a regular contributor to SI.com.