Simple here's how it goes down, easy going first round for PAC, JMM pressing hard edges it.
10-9 JMM

2nd round JMM tries to build on his success with the straight right and gets caught with a left uppercut.
10-8 PAC

3rd round JMM works hard to try get back some points PAC steps out peppering JMM and opens a cut over JMM's eye.
10-9 PAC

4th round JMM starts to look his age, PAC goes on to unrelenting attack scores 3 knockdowns fight is waived off and Dinamita is stopped for the first time.

That's my guess.