Answer

Items in their inventory when the game ended, across 9 games.

Item	Games	Of all games	Win rate
Blink Dagger	5	55.6%	60.0%
Aghanim's Scepter	4	44.4%	75.0%
Phase Boots	4	44.4%	75.0%
Abyssal Blade	3	33.3%	66.7%
Arcane Boots	3	33.3%	33.3%
Bracer	3	33.3%	33.3%
Sentry Ward	2	22.2%	50.0%
Manta Style	2	22.2%	50.0%
Eye of Skadi	2	22.2%	50.0%
Black King Bar	2	22.2%	50.0%
Radiance	2	22.2%	50.0%
Dust of Appearance	2	22.2%	0.0%
Shiva's Guard	1	11.1%	100.0%
Mage Slayer	1	11.1%	100.0%
Morbid Mask	1	11.1%	100.0%
Disperser	1	11.1%	100.0%
Nullifier	1	11.1%	100.0%
Satanic	1	11.1%	100.0%
Heart of Tarrasque	1	11.1%	100.0%
Sange and Yasha	1	11.1%	100.0%
Ogre Axe	1	11.1%	100.0%
Monkey King Bar	1	11.1%	100.0%
Force Staff	1	11.1%	100.0%
Eul's Scepter of Divinity	1	11.1%	100.0%
Magic Stick	1	11.1%	0.0%
Iron Branch	1	11.1%	0.0%
Rod of Atos	1	11.1%	0.0%
Platemail	1	11.1%	0.0%
Blade Mail	1	11.1%	0.0%
Maelstrom	1	11.1%	0.0%
Power Treads	1	11.1%	0.0%