Mark J. Rebilas/US Presswire

Freddy Sanchez could have a new address by the time the July 31 trade deadline passes.

By Steve Phillips, ESPN

The trade deadline is fewer than 10 days away … so which teams can we expect to make some moves? Well, 20 teams started play Tuesday within 6½ games of a playoff spot, so it's tough to say. With so few players available and so many teams with needs, though, this is definitely a seller's market.

In the American League, the Yankees and Red Sox both appear to be locks for the playoffs. They're the two best teams in the AL; one will win the division, one the wild card. That leaves the Tigers, White Sox and Twins in the Central, and the Angels, Rangers and Mariners in West, all vying for just the remaining two divisional berths. Any of those teams could make a deal and put itself over the top to make the postseason.

The Dodgers and Phillies seem to be the elite teams in the National League and probably will make the postseason regardless of whether they make a trade. The clincher for the NL World Series participant in October, though, could come down to which one of these two teams makes a deal now. Then there's the wild card, which could be a very crowded race down the stretch as seven teams entered Tuesday within 4½ games of the lead.

It might come down to general managers deciding who goes to the playoffs. As close as the races are, if you want to be a playoff team and don't make a deal, you'd better hope your closest competition doesn't make one, either. It's so bunched together that any single move could be the difference-maker in the pennant race.

Roy Halladay's name has been thrown around a lot recently, and he is the biggest difference-maker out there. And in the end, I do think he will be traded. Out to defend their championship, the Phillies are obviously interested, and they're an especially appealing team to play for because of their highly productive offense. Halladay would have a chance to win a ton of games with an outstanding defense and offense in support. The Phillies have the minor league talent to make a deal, but they probably are going to have to part ways with J.A. Happ and Kyle Drabek in addition to multiple other prospects. Halladay is at peak value now because he's pitching well, he's healthy and teams could have him for the next year and a half. And the Jays say they want a deal done by July 28. Let's not forget, though, that Halladay has a no-trade clause, so he controls where he ultimately will land. Philadelphia has the most motivation to put a deal together, but the Red Sox, Cardinals, Dodgers, White Sox and Rangers also could be in the mix for Halladay.

Keep in mind, if the Blue Jays do end up trading Halladay, they're probably going to open the vault entirely, and players such as Alex Rios, Lyle Overbay, Scott Rolen and Marco Scutaro would become available, as well. If they keep Halladay, though, they might try to keep the roster together into next year and see what happens from there.

Elsewhere, the Pirates' recent attempt to lock up their middle infield of Jack Wilson and Freddy Sanchez to multiyear extensions didn't get far, so I suspect both will be traded. Back in 2004, the Red Sox added Orlando Cabrera to upgrade their defense, and it was the finishing touch to their run to the World Series. I could see Wilson serving that role for the Red Sox this year. Sanchez plays with high energy and has the ability to hit for average, and I think he would be a great fit for the Giants, who need to add hitting to support their pitching. The Cubs also could use Sanchez as a catalyst for their offense, which has been struggling.

Matt Holliday is another name out there, although it's unclear whether Athletics GM Billy Beane would be able to get what he's looking for in return. There's speculation that the Red Sox could make a grab at Holliday, but teams such as Seattle, which could use his production in the outfield, and St. Louis, which needs more support in the lineup for Albert Pujols, are also likely suitors.

As the trade deadline drama undoubtedly ramps up in the coming days, though, here's some important advice to keep in mind: If you're hearing rumors about trade proposals that are clearly tipped in one team's favor, it's likely that the rumor started from within that very same clubhouse. Lopsided deals typically don't get made, so don't believe everything you read or hear.

Past Baseball Tonight Clubhouses: July 20 | July 19 | July 16 | July 15 | July 14

HALL OF FAME BY THE NUMBERS: NO. 21

Editor's Note: This week, leading up to the Hall of Fame induction ceremony Sunday in Cooperstown, N.Y., Baseball Tonight is highlighting the five greatest uniform numbers in baseball history, based on the players (both Hall of Famers and future Hall of Famers) who have worn them, and debating which player was the best to ever don that number.

By Tim Kurkjian, ESPN

The greatest No. 21 ever covers a lot of ground, as did one of the best No. 21's ever, Roberto Clemente. It takes us back to World War II, to Forbes Field and the Red Sox of the mid 1980s. But not all of the ground is sacred; No. 21 also includes the scandal of steroids.

That didn't affect Warren Spahn, who won a Bronze Star and a Purple Heart, and he won 363 games, the fifth most all time, the most by a left-hander in baseball history. He threw 63 shutouts, he won 20 games 13 times and led the National League in wins eight times. He was the most durable pitcher ever; he averaged over 20 wins for three years in his 40s.

Clemente won 12 Gold Gloves, was perhaps the greatest defensive right fielder of all time, and had perhaps the best throwing arm of any outfielder in history. He hit .317, won four batting titles and one MVP award, and had 3,000 hits, the final one coming on the last day of the 1972 season, a few months before he died in a plane crash on a mission of mercy.

The Greatest No. 21

Who was the greatest player to wear No. 21 in baseball history? • Roger Clemens • Roberto Clemente • Bob Lemon • Sammy Sosa • Warren Spahn Register your vote

Roger Clemens wore No. 21 for 13 years for the Red Sox and two years with the Blue Jays, apparently most of those years came before his alleged use of steroids. For Boston, he won three Cy Young awards, won 192 games and threw 38 shutouts, tying Cy Young for the franchise lead in each. With Toronto, he won a Cy Young and won the Triple Crown of pitching in 1997 and 1998. Wearing No. 21, he went 243-124, a .662 winning percentage.

Sammy Sosa, whose legacy also is tarnished by alleged steroid use, hit the fifth most homers all time and had the most -- 479 -- during any 10-year period. He holds the NL record with six straight 40-homer seasons. There have been eight 60-homer seasons, he has three. And finally, Hall of Famer Bob Lemon rounds out the No. 21. He won 207 games, and averaged 21 for a nine-year period for Cleveland.

Like in blackjack, with 21, you win.

TOUCH 'EM ALL

Who went deep? Keep track of all the home runs hit each day on "Baseball Tonight" and on the Baseball Tonight Clubhouse page.

For more, check out the Home Run Tracker page.

Home Run Tracker
NAME	HR	OPP	PITCHER	SITUATION
B. Butler, KC	9	LAA	Santana	Bot 5: 3-0, 1 Outs. 1 on.
M. Napoli, LAA	12	KC	Ponson	Top 6: 1-0, 0 Outs. None on.
M. Ordonez, Det	5	Sea	Olson	Bot 1: 2-2, 0 Outs. Gr. Slam.
J. Rollins, Phi	8	ChC	Harden	Bot 3: 3-0, 0 Outs. None on.
P. Polanco, Det	7	Sea	Olson	Bot 2: 2-0, 1 Outs. None on.
B. McCann, Atl	10	SF	Sadowski	Bot 4: 1-0, 2 Outs. 2 on.
M. DeRosa, StL	14	Hou	Rodriguez	Top 2: 3-2, 1 Outs. None on.

The complete list of Tuesday's homers