Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This build for Malzahar is best I know to 1vs1.
In easy game Rod of Ages will up Your survivability. But when You will have 1000 ap sell it and buy another Archangel.
When You will stack your Archangel's Staffs Malz will have about 1300 ability power.
So while You see someone, use Null Zone and then Nether Grasp and Your enemy will be death.
On 1300 ap Null Zone deal 27% of max hp each second for 5 seconds.
Tell me what do You think about that.