This Andy Pettitte looks authentic to me, but I could be wrong.

The seller also has these for sale.  I'm not familiar with Don Mattingly or rookie Mariano Rivera signatures.  

The coa for the Mariano :

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I don't like the Rivera.  

The Mattingly is authentic... I've never seen a Mo like that... unless it's some super early version.

Thanks guys!  The Mo definitely didn't look good to me and I haven't spent time learning Don Mattingly.  Thanks for the opinions! Seller said he used to play professionally and his roommate helped him get signatures; he gave names but I rather let the signatures talk for themselves when deciding authenticity.  

The Pettitte looks spot on to me.  Here was one with psa authentication that I think compares favorably to the one above:

the Pettitte looks good.  I still don't like the Rivera!

Thanks Terrier!  I won't be touching the Rivera haha

The Rivera may be alright . Pre 2000 sig. I would have jsa or psa look at it . I pulled some I got in 97-99 and none match up exactly but I would have a them take a look .

Thanks Anthony!  Do you believe the Pettitte to be good as well?

Yeah Pettitte and Mattingly both look good .
Also after looking more into the Rivera it may be no good . Did the other baseballs come with the same coa ?

Only the Rivera had that coa.  

I know nothing about the signatures...so trust the others that have commented with regards to Pettite and Mattingly.  But a COA that misspells "memorabilia" draws questions...so does the story of "i was a professional player, but my roommate got this for me."  And if the story is legit and his roommate got the ball signed himself, why does it have a COA --at all-- much rather from a company no one has heard from.  

The only ball that has that Coa is the Mariano.  I agree with you, it does look fishy with the Mariano and the mispelled CoA, but believe it or not the seller provided his name and it did match up to a baseball player who was cut from the Brewers (he said his roommate was another Brewers player) Dan Merklinger is the seller's name.  

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