Nick Calathes, Damian Lillard

Grizzlies guard Nick Calathes suspended 20 games for violating NBA’s anti-drug policy

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UPDATE 4-19, 1:54 am: The NBA has confirmed the suspension, just as previously reported. The 20-game suspension begins on Saturday when the Grizzlies take on the Thunder in the first round of the playoffs.

The positive test was for Tamoxifen, which is on the banned substance list because it can be used as a masking agent for steroid use.

4-18 7:49 pm: On the eve of the NBA playoffs, things just got much more difficult for the Memphis Grizzlies.

This is an odd one, as a cursory search shows that Tamoxifen “treats advanced breast cancer in men and women, and early breast cancer in women. Also may prevent breast cancer in women who are at a high risk because of age, family history, or other factors.”

It appears to be geared toward women specifically, as this WebMD post would seem to indicate. But apparently, it can also be used to mask steroids.

From William Harris of How Stuff Works:

Many breast cancers have receptors for estrogen, a hormone that promotes the development and maintenance of female characteristics of the body. When estrogen molecules fit into these receptors, like a key fitting into a lock, the malignant cells become activated. Tamoxifen blocks these estrogen receptors, interfering with the cancer’s ability to grow and develop. This is why scientists refer to tamoxifen as an anti-estrogenic agent.

Now let’s turn our attention to a home-run slugger taking steroid injections — usually synthetic testosterone — to grow his muscles. Large doses of the male hormone cause the body to produce additional estrogen. This in turn can result in enlarged breasts, a feature that most power hitters find unappealing. To counteract the effects of estrogen and mask their steroid use, these players may opt to take tamoxifen. That means anti-estrogens don’t really enhance performance, but, because they alleviate symptoms of PEDs, they appear on the World Anti-Doping Agency’s list of more than 200 banned substances and methods.

Calathes is in his first year with Memphis, and though casual fans may have no idea who he is, his absence from the first round of the playoffs will hurt the Grizzlies chances.

Calathes has been getting legitimate time in the rotation backing up Mike Conley, averaging 16.5 minutes per game. With him now unavailable, Memphis will likely be forced into playing Knicks castoff Beno Udrih, and that’s a severe downgrade, especially defensively.

Wojnarowski reports that the NBA is expected to make the announcement official late Friday or sometime on Saturday. The Grizzlies open the playoffs in Oklahoma City against the Thunder at 9:30 p.m. ET on Saturday.

Dion Waiters explains decision to sign with the Heat in an Instagram post

OKLAHOMA CITY, OK - MAY 24:  Dion Waiters #3 of the Oklahoma City Thunder reacts in the first quater against the Golden State Warriors in game four of the Western Conference Finals during the 2016 NBA Playoffs at Chesapeake Energy Arena on May 24, 2016 in Oklahoma City, Oklahoma. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement.  (Photo by Ronald Martinez/Getty Images)
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On Monday, Dion Waiters agreed to a one-year, $2.9 million deal with the Heat, far less than most people thought he would get as one of the few significant free agents still on the market. Tuesday afternoon, he posted an explanation on Instagram for his deal.

Here’s what he said:

I didn’t do it for the money… I did it for the opportunity to go out & ball & have fun. Everything else will take care of its self!!! I just felt like it was the best situation for me…& my family. I could have waited & got wat I wanted. But I rather be happy then miserable at the end of the day!!! Meaning Yu can have everything & still not be happy… #heatnation let’s get it!!! #provethemwrong #stamped #Philly

It seems clear, based on the market, that the kinds of offers Waiters was hoping for weren’t out there for him. In Miami, with Dwyane Wade gone, he’ll probably start at shooting guard and have plenty of opportunities to prove himself in hopes of landing a long-term deal next summer.

Report: Celtics sign second-round pick Demetrius Jackson to four-year deal

PHILADELPHIA, PA - MARCH 27:  Demetrius Jackson #11 of the Notre Dame Fighting Irish walks to the bench late in the second half against the North Carolina Tar Heels during the 2016 NCAA Men's Basketball Tournament East Regional Final at Wells Fargo Center on March 27, 2016 in Philadelphia, Pennsylvania.  (Photo by Elsa/Getty Images)
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While we wait for the Celtics to make a bigger move to trade for another star, they’re filling out the end of their roster. Sheridan Hoops’ Michael Scotto is reporting that they’ve signed Demetrius Jackson, the No. 45 pick in last month’s draft, to a four-year deal.

Jackson declared for the draft after his junior season at Notre Dame. Talent-wise, he has the chance to be a major steal for Boston — DraftExpress has him ranked as the 17th-best overall prospect in this year’s draft class. But he might not play much his first year. The Celtics’ roster is already crowded and there’s still the chance that they’ll make another move with some of their much-vaunted assets if the right star becomes available.

Hawks sign former Michigan State center Matt Costello

ST LOUIS, MO - MARCH 18: Matt Costello #10 of the Michigan State Spartans handles the ball against Darnell Harris #0 of the Middle Tennessee Blue Raiders in the second half during the first round of the 2016 NCAA Men's Basketball Tournament at Scottrade Center on March 18, 2016 in St Louis, Missouri.  (Photo by Dilip Vishwanat/Getty Images)
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ATLANTA (AP) — The Atlanta Hawks have signed undrafted rookie free agent center Matt Costello of Michigan State.

The 6-foot-9, 245-pound Costello averaged 5.7 points and 5 rebounds on the Hawks’ summer league team in Las Vegas.

Costello averaged 10.7 points and 8.2 rebounds as a senior at Michigan State. He holds the school’s career record with 146 blocked shots.

Terms of the deal were not released.

Watch Jamal Crawford drop an effortless 44, hit game winner at Seattle pro-am

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Jamal Crawford knows how to get buckets.

He does it against NBA level defenders, so put him in a free-flowing pro-am — let’s say the Seattle pro-am in his hometown — and he barely breaks a sweat dropping 44. And nailing the game winner.

Doc Rivers hopes to see a lot of that next season.